Practice A: Estimating with Whole Numbers Round each number to the greatest place value. 1. 67 _____ 2. 81 _____ 3. 24 _____ 4. 115 _____ 5. 575 _____ 6. 1,852 _____ Estimate each sum or difference. 7. 42 19 8. 63 28 9. 37 34    10. 93 14 11. 104 178 12. 112 9    Estimate each product. 13. 2 19 14. 87 2 15. 26 3    Rewrite each problem using compatible numbers. Then divide. 16. 148 5 17. 412 4 18. 70 6    19. 62 3 20. 40 7 21. 29 4    22. A fin whale weighs 44 tons. A gray whale weighs 32 tons. About how much more does a fin whale weigh than a gray whale? 23. The Suez Canal in is 108 miles long. The Erie Canal in is 363 miles long. About how long are the two canals together?
Practice A: Estimating with Whole Numbers Round each number to the greatest place value. 1. 67 _____ 2. 81 _____ 3. 24 _____ 4. 115 _____ 5. 575 _____ 6. 1,852 _____ Estimate each sum or difference. 7. 42  19 8. 63  28 9. 37  34 10. 93  14 11. 104  178 12. 112  9 Estimate each product. 13. 2  19 14. 87  2 15. 26  3 Rewrite each problem using compatible numbers. Then divide. 16. 148  5 17. 412  4 18. 70  6 19. 62  3 20. 40  7 21. 29  4 22. A fin whale weighs 44 tons. A gray whale weighs 32 tons. About how much more does a fin whale weigh than a gray whale? 23. The Suez Canal in is 108 miles long. The Erie Canal in is 363 miles long. About how long are the two canals together?