Estimate a product
Name: _____________________ Date: __________
Show your thinking with numbers, words, or a drawing.
1. Estimate 68 × 5 by rounding 68 to the nearest ten.
2. Estimate 83 × 7 by rounding 83 to the nearest ten.
3. Estimate 44 × 8 by rounding 44 to the nearest ten.
4. Estimate 48 × 8 by rounding 48 to the nearest ten.
5. Estimate 18 × 5 by rounding 18 to the nearest ten.
Answer key · Estimate a product
1. 350
68 rounds to 70.
Basic fact: 7 × 5 = 35. Then put on 1 zero.
70 × 5 = 350, so the estimate is 350.
2. 560
83 rounds to 80.
Basic fact: 8 × 7 = 56. Then put on 1 zero.
80 × 7 = 560, so the estimate is 560.
3. 320
44 rounds to 40.
Basic fact: 4 × 8 = 32. Then put on 1 zero.
40 × 8 = 320, so the estimate is 320.
4. 400
48 rounds to 50.
Basic fact: 5 × 8 = 40. Then put on 1 zero.
50 × 8 = 400, so the estimate is 400.
5. 100
18 rounds to 20.
Basic fact: 2 × 5 = 10. Then put on 1 zero.
20 × 5 = 100, so the estimate is 100.
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.