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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 431 · 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. 1.286 + 47 =
  2. 2.312 + 99 =
  3. 3.494 + 48 =
  4. 4.374 + 57 =
  5. 5.263 + 37 =
  6. 6.447 + 39 =
  7. 7.285 + 48 =
  8. 8.450 + 58 =
  9. 9.414 + 69 =
  10. 10.344 + 89 =
  11. 11.366 + 88 =
  12. 12.252 + 68 =
  13. 13.261 + 69 =
  14. 14.371 + 89 =
  15. 15.211 + 98 =
  16. 16.161 + 79 =
  17. 17.278 + 37 =
  18. 18.30 + 97 =
  19. 19.148 + 27 =
  20. 20.463 + 59 =
  21. 21.88 + 79 =
  22. 22.300 + 17 =
  23. 23.321 + 28 =
  24. 24.403 + 28 =
  25. 25.433 + 39 =
  26. 26.210 + 17 =
  27. 27.190 + 68 =
  28. 28.499 + 19 =
  29. 29.489 + 78 =
  30. 30.334 + 87 =
  31. 31.302 + 57 =
  32. 32.291 + 37 =
  33. 33.168 + 97 =
  34. 34.174 + 38 =
  35. 35.480 + 77 =
  36. 36.119 + 37 =
  37. 37.62 + 77 =
  38. 38.320 + 28 =
  39. 39.71 + 38 =
  40. 40.474 + 89 =

Answer key

  1. 333
  2. 411
  3. 542
  4. 431
  5. 300
  6. 486
  7. 333
  8. 508
  9. 483
  10. 433
  11. 454
  12. 320
  13. 330
  14. 460
  15. 309
  16. 240
  17. 315
  18. 127
  19. 175
  20. 522
  21. 167
  22. 317
  23. 349
  24. 431
  25. 472
  26. 227
  27. 258
  28. 518
  29. 567
  30. 421
  31. 359
  32. 328
  33. 265
  34. 212
  35. 557
  36. 156
  37. 139
  38. 348
  39. 109
  40. 563

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