1. When we count forwards by ones, how many are we adding each time?
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 1 Video, Investigation and Problem Solving.
You chose well! If you can explain your understanding, we recommend you go to ADDITION AND SUBTRACTION ASSESSMENT 2 below.
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 1 Video, Investigation and Problem Solving.
2. When we count backwards by ones, how many are we subtracting each time?
You chose well! If you can explain your understanding, we recommend you go to ADDITION AND SUBTRACTION ASSESSMENT 3 below.
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 2 Video, Investigation and Problem Solving.
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 2 Video, Investigation and Problem Solving.
3. How could we record counting by ones to add 7 and 5?
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 3 Video, Investigation and Problem Solving.
You chose well! If you can explain your understanding, we recommend you go to ADDITION AND SUBTRACTION ASSESSMENT 4 below.
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 3 Video, Investigation and Problem Solving.
4. How could we record counting by ones to subtract 2 from 7?
You chose well! If you can explain your understanding, we recommend you go to ADDITION AND SUBTRACTION ASSESSMENT 5 below.
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 4 Video, Investigation and Problem Solving.
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 4 Video, Investigation and Problem Solving.
5. Mary said 7 + 5 equals 5 + 7. Is she right?
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 5 Video, Investigation and Problem Solving.
You chose well! If you can explain your understanding, we recommend you click the ASSESSMENT menu, select PLACE VALUE, go to LEVELS 6, 7 and 8.
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 5 Video, Investigation and Problem Solving.
6. How could we add 5 and 7 using place value?
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 6 Video, Investigation and Problem Solving.
You chose well! If you can explain your understanding, we recommend you go to ADDITION AND SUBTRACTION ASSESSMENT 7 below.
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 6 Video, Investigation and Problem Solving.
7. How could we subtract 5 from 12 using place value?
You chose well! If you can explain your understanding, we recommend you click the ASSESSMENT menu, select PLACE VALUE, go to LEVELS 9, 10 AND 11.
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 7 Video, Investigation and Problem Solving.
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 7 Video, Investigation and Problem Solving.
8. How could we subtract 5 from 22 using place value?
You chose well! If you can explain your understanding, we recommend you go to ADDITION AND SUBTRACTION ASSESSMENT 9 below.
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 8 Video, Investigation and Problem Solving.
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 8 Video, Investigation and Problem Solving.
9. How could we subtract 7 from 35 using place value?
You chose well! If you can explain your understanding, we recommend you go to ADDITION AND SUBTRACTION ASSESSMENT 10 below.
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 9 Video, Investigation and Problem Solving.
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 9 Video, Investigation and Problem Solving.
10. If we add 8 and 0, what do we get?
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 10 Video, Investigation and Problem Solving.
You chose well! If you can explain your understanding, we recommend you go to ADDITION AND SUBTRACTION ASSESSMENT 11 below.
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 10 Video, Investigation and Problem Solving.
11. How could Mark add 3 + 5 + 7 using friends of 10 to make it easier?
You chose well! If you can explain your understanding, we recommend you go to ADDITION AND SUBTRACTION ASSESSMENT 12 below.
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 11 Video, Investigation and Problem Solving.
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 11 Video, Investigation and Problem Solving.
12. What number makes this sentence is true?   3 + 8 = ____ – 4
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 12 Video, Investigation and Problem Solving.
You chose well! If you can explain your understanding, we recommend you click the ASSESSMENT menu, select PLACE VALUE, go to LEVEL 12.
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 12 Video, Investigation and Problem Solving.
13. How could we subtract 50 from 120 using place value?
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 13 Video, Investigation and Problem Solving.
You chose well! If you can explain your understanding, we recommend you click the ASSESSMENT menu, select PLACE VALUE, go to LEVELS 13, 14, 15 and 16.
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 13 Video, Investigation and Problem Solving.
14. How could we add 50 and 70 using place value?
You chose well! If you can explain your understanding, we recommend you go to ADDITION AND SUBTRACTION ASSESSMENT 15 below.
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 14 Video, Investigation and Problem Solving.
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 14 Video, Investigation and Problem Solving.
15. How could we add 72 and 50 using place value?
You chose well! If you can explain your understanding, we recommend you go to ADDITION AND SUBTRACTION ASSESSMENT 16 below.
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 15 Video, Investigation and Problem Solving.
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 15 Video, Investigation and Problem Solving.
16. How could we subtract 50 from 127 using place value?
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 16 Video, Investigation and Problem Solving.
You chose well! If you can explain your understanding, we recommend you go to ADDITION AND SUBTRACTION ASSESSMENT 17 below.
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 16 Video, Investigation and Problem Solving.
17. How could we subtract 58 from 126 using place value?
You chose well! If you can explain your understanding, we recommend you go to ADDITION AND SUBTRACTION ASSESSMENT 18 below.
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 17 Video, Investigation and Problem Solving.
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 17 Video, Investigation and Problem Solving.
18. How much money will we have if we have these coins, then spend 25 cents?
You chose well! If you can explain your understanding, we recommend you go to ADDITION AND SUBTRACTION ASSESSMENT 19 below.
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 18 Video, Investigation and Problem Solving.
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 18 Video, Investigation and Problem Solving.
19. How many ways can we find the difference between 2 numbers?
You chose well! If you can explain your understanding, we recommend you go to ADDITION AND SUBTRACTION ASSESSMENT 20 below.
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 19 Video, Investigation and Problem Solving.
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 19 Video, Investigation and Problem Solving.
20. What number sentence could we record to solve this problem? Betty had 64 shells. She kept 12 and gave the rest to Ben. How many shells did Betty give to Ben?
You chose well! If you can explain your understanding, we recommend you click the ASSESSMENT menu, select PLACE VALUE, go to LEVEL 17.
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 20 Video, Investigation and Problem Solving.
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 20 Video, Investigation and Problem Solving.
21. How could we subtract 589 from 972 using compensation?
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 21 Video, Investigation and Problem Solving.
You chose well! If you can explain your understanding, we recommend you go to ADDITION AND SUBTRACTION ASSESSMENT 22 below.
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 21 Video, Investigation and Problem Solving.
22. What number makes this sentence is true?  23 + 18 = ____ – 4
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 22 Video, Investigation and Problem Solving.
You chose well! If you can explain your understanding, we recommend you go to ADDITION AND SUBTRACTION ASSESSMENT 23 below.
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 22 Video, Investigation and Problem Solving.
23. If we buy items for $4.75 and $5.62, and pay cash, how much will we pay?
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 23 Video, Investigation and Problem Solving.
You chose well! If you can explain your understanding, we recommend you click the ASSESSMENT menu, select PLACE VALUE, go to LEVEL 19.
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 23 Video, Investigation and Problem Solving.
24. How could we subtract $158.97 from $627.22 using compensation?
You chose well! If you can explain your understanding, we recommend you go to ADDITION AND SUBTRACTION ASSESSMENT 25 below.
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 24 Video, Investigation and Problem Solving.
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 24 Video, Investigation and Problem Solving.
25. Mary added 67 and 85 and 71 and got an odd number. Could she be right?
You chose well! If you can explain your understanding, we recommend you click the ASSESSMENT menu, select FRACTIONS AND DECIMALS, go to LEVEL 14.
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 25 Video, Investigation and Problem Solving.
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 25 Video, Investigation and Problem Solving.
26. What rule describes how this number pattern repeats?
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 26 Video, Investigation and Problem Solving.
You chose well! If you can explain your understanding, we recommend you go to ADDITION AND SUBTRACTION ASSESSMENT 27 below.
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 26 Video, Investigation and Problem Solving.
27. What missing number sentence matches this problem: When a number is added to 23, the answer is the same as 57 minus 19. What is the number?
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 27 Video, Investigation and Problem Solving.
You chose well! If you can explain your understanding, we recommend you go to ADDITION AND SUBTRACTION ASSESSMENT 28 below.
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 27 Video, Investigation and Problem Solving.
28.
You chose well! If you can explain your understanding, we recommend you click the ASSESSMENT menu, select FRACTIONS AND DECIMALS, go to LEVEL 24 OR select PLACE VALUE, go to LEVEL 27 (these are the same concept!) and then FRACTIONS AND DECIMALS, go to LEVEL 22 OR select PLACE VALUE, go to LEVEL 26 (these are the same concept!)
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 28 Video, Investigation and Problem Solving.
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 28 Video, Investigation and Problem Solving.
29. How could we add 7.5 + 8.6 using place value using place value?
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 29 Video, Investigation and Problem Solving.
You chose well! If you can explain your understanding, we recommend you click the ASSESSMENT menu, select FRACTIONS AND DECIMALS, go to LEVEL 28.
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 29 Video, Investigation and Problem Solving.
30.
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 30 Video, Investigation and Problem Solving.
You chose well! If you can explain your understanding, we recommend you go to ADDITION AND SUBTRACTION ASSESSMENT 31 below.
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 30 Video, Investigation and Problem Solving.
31. What rule describes this number pattern?
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 31 Video, Investigation and Problem Solving.
You chose well! If you can explain your understanding, we recommend you go to ADDITION AND SUBTRACTION ASSESSMENT 32 below.
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 31 Video, Investigation and Problem Solving.
32. It was 7 degrees. Then the temperature fell 10 degrees. What would the temperature be now?
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 32 Video, Investigation and Problem Solving.
You chose well! If you can explain your understanding, we recommend you go to ADDITION AND SUBTRACTION ASSESSMENT 33 below.
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 32 Video, Investigation and Problem Solving.
33. 8 + 2 x 5 =
You chose well!
Not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 33 Video, Investigation and Problem Solving.
Not sure or not ready yet to explain your understanding? To deepen your understanding, we recommend you click the CONCEPT menu, select ADDITION AND SUBTRACTION, go to LEVEL 33 Video, Investigation and Problem Solving.