Add ones column. If 10 or more, write ones digit and carry the 1 to tens.
Don't forget to add the carried 1 to the tens column!
Estimate First! Round to tens, estimate, then calculate the actual answer.
28 + 35
Round to tens: 30 + 40 = 70
Estimate:
Actual:
47 + 56
Round to tens: 50 + 60 = 110
Estimate:
Actual:
69 + 28
Round to tens: 70 + 30 = 100
Estimate:
Actual:
78 + 45
Round to tens: 80 + 50 = 130
Estimate:
Actual:
Write each step. Show where the carried 1 goes.
28 + 35
Ones: 8 + 5 = 13
Regroup: 13 = 1 ten + 3 ones
Write ___ in ones place, carry 1 to tens
Tens: 2 + 3 + 1 (carried) =
Total:
47 + 26
Ones: 7 + 6 = 13
Regroup: 13 = 1 ten + 3 ones
Write ___ in ones place, carry 1 to tens
Tens: 4 + 2 + 1 (carried) =
Total:
Use ANY strategy you prefer. Try a different one for each problem.
78 + 19 =
Strategy I used:
56 + 38 =
Strategy I used:
69 + 27 =
Strategy I used:
87 + 16 =
Strategy I used:
Number Talk — Explain WITHOUT calculating.
If 39 + 24 = 63, what is 39 + 25?
My thinking:
If 47 + 26 = 73, what is 57 + 26?
My thinking: