Estimate sums and differences
Name: _____________________ Date: __________
Show your thinking with numbers, words, or a drawing.
1. Estimate 46 − 21 by rounding each number to the nearest ten.
2. Estimate 63 − 46 by rounding each number to the nearest ten.
3. Estimate 53 − 18 by rounding each number to the nearest ten.
4. Estimate 81 + 69 by rounding each number to the nearest ten.
5. Estimate 38 + 82 by rounding each number to the nearest ten.
Answer key · Estimate sums and differences
1. 30
46 rounds to 50 and 21 rounds to 20.
50 − 20 = 30, so the estimate is 30.
2. 10
63 rounds to 60 and 46 rounds to 50.
60 − 50 = 10, so the estimate is 10.
3. 30
53 rounds to 50 and 18 rounds to 20.
50 − 20 = 30, so the estimate is 30.
4. 150
81 rounds to 80 and 69 rounds to 70.
80 + 70 = 150, so the estimate is 150.
5. 120
38 rounds to 40 and 82 rounds to 80.
40 + 80 = 120, so the estimate is 120.
Try it together
Choose a question from the printable. Use objects or a drawing to show your thinking, then explain your method to someone at home.