Subtracting with regrouping
Answers are for parents and teachers.
1
Subtract, then check by adding: 56 − 28, 73 − 45 and 90 − 66.
28 (28 + 28 = 56), 28 (28 + 45 = 73) and 24 (24 + 66 = 90).
2
Estimate first, then subtract exactly: 87 − 42, 95 − 58 and 64 − 29.
Estimates: 90 − 40 = 50, 100 − 60 = 40, 60 − 30 = 30. Exact: 45, 37 and 35.
3
Subtract: 365 − 128, 482 − 157 and 610 − 235.
237, 325 and 375.
4
Make up a story for 72 − 39 and solve it.
Any sensible story. The answer is 72 − 39 = 33.
5
The blocks show 234. You take away 119. How many are left?
234 − 119 = 115.