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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 491 · 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. 1.50 + 37 =
  2. 2.75 + 58 =
  3. 3.343 + 37 =
  4. 4.495 + 57 =
  5. 5.79 + 38 =
  6. 6.339 + 97 =
  7. 7.386 + 78 =
  8. 8.168 + 49 =
  9. 9.352 + 89 =
  10. 10.186 + 88 =
  11. 11.26 + 17 =
  12. 12.131 + 89 =
  13. 13.303 + 37 =
  14. 14.178 + 37 =
  15. 15.360 + 89 =
  16. 16.496 + 19 =
  17. 17.498 + 97 =
  18. 18.317 + 37 =
  19. 19.274 + 79 =
  20. 20.262 + 47 =
  21. 21.373 + 77 =
  22. 22.200 + 49 =
  23. 23.126 + 77 =
  24. 24.413 + 99 =
  25. 25.460 + 38 =
  26. 26.75 + 29 =
  27. 27.409 + 37 =
  28. 28.122 + 87 =
  29. 29.62 + 49 =
  30. 30.33 + 89 =
  31. 31.166 + 38 =
  32. 32.39 + 59 =
  33. 33.252 + 37 =
  34. 34.406 + 57 =
  35. 35.409 + 98 =
  36. 36.56 + 67 =
  37. 37.448 + 39 =
  38. 38.459 + 59 =
  39. 39.420 + 27 =
  40. 40.402 + 87 =

Answer key

  1. 87
  2. 133
  3. 380
  4. 552
  5. 117
  6. 436
  7. 464
  8. 217
  9. 441
  10. 274
  11. 43
  12. 220
  13. 340
  14. 215
  15. 449
  16. 515
  17. 595
  18. 354
  19. 353
  20. 309
  21. 450
  22. 249
  23. 203
  24. 512
  25. 498
  26. 104
  27. 446
  28. 209
  29. 111
  30. 122
  31. 204
  32. 98
  33. 289
  34. 463
  35. 507
  36. 123
  37. 487
  38. 518
  39. 447
  40. 489

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