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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 472 · 40 questions
TalentJR

The fast method (Round up, then fix): Round the number ending in 7, 8 or 9 up to the next ten: 39 → 40. Add the round number. Take away the extra you added (here 1).

NameDateTime takenScore ___ / 40
  1. 1.215 + 97 =
  2. 2.436 + 98 =
  3. 3.351 + 38 =
  4. 4.167 + 57 =
  5. 5.197 + 49 =
  6. 6.365 + 79 =
  7. 7.96 + 28 =
  8. 8.375 + 28 =
  9. 9.400 + 77 =
  10. 10.242 + 37 =
  11. 11.334 + 89 =
  12. 12.224 + 18 =
  13. 13.59 + 77 =
  14. 14.387 + 77 =
  15. 15.80 + 19 =
  16. 16.91 + 29 =
  17. 17.489 + 19 =
  18. 18.378 + 89 =
  19. 19.49 + 67 =
  20. 20.420 + 48 =
  21. 21.155 + 19 =
  22. 22.107 + 17 =
  23. 23.51 + 87 =
  24. 24.150 + 79 =
  25. 25.337 + 68 =
  26. 26.213 + 89 =
  27. 27.251 + 98 =
  28. 28.418 + 38 =
  29. 29.123 + 97 =
  30. 30.485 + 39 =
  31. 31.348 + 79 =
  32. 32.293 + 37 =
  33. 33.412 + 38 =
  34. 34.47 + 79 =
  35. 35.315 + 38 =
  36. 36.446 + 78 =
  37. 37.170 + 79 =
  38. 38.98 + 17 =
  39. 39.344 + 37 =
  40. 40.331 + 27 =

Answer key

  1. 312
  2. 534
  3. 389
  4. 224
  5. 246
  6. 444
  7. 124
  8. 403
  9. 477
  10. 279
  11. 423
  12. 242
  13. 136
  14. 464
  15. 99
  16. 120
  17. 508
  18. 467
  19. 116
  20. 468
  21. 174
  22. 124
  23. 138
  24. 229
  25. 405
  26. 302
  27. 349
  28. 456
  29. 220
  30. 524
  31. 427
  32. 330
  33. 450
  34. 126
  35. 353
  36. 524
  37. 249
  38. 115
  39. 381
  40. 358

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