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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 684 · 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. 1.491 + 49 =
  2. 2.151 + 27 =
  3. 3.312 + 58 =
  4. 4.347 + 99 =
  5. 5.197 + 67 =
  6. 6.360 + 17 =
  7. 7.129 + 58 =
  8. 8.53 + 17 =
  9. 9.402 + 89 =
  10. 10.88 + 19 =
  11. 11.393 + 77 =
  12. 12.299 + 18 =
  13. 13.123 + 29 =
  14. 14.457 + 29 =
  15. 15.471 + 78 =
  16. 16.396 + 19 =
  17. 17.194 + 59 =
  18. 18.269 + 27 =
  19. 19.450 + 59 =
  20. 20.355 + 98 =
  21. 21.64 + 28 =
  22. 22.256 + 37 =
  23. 23.41 + 49 =
  24. 24.25 + 38 =
  25. 25.121 + 48 =
  26. 26.397 + 48 =
  27. 27.54 + 38 =
  28. 28.93 + 29 =
  29. 29.399 + 59 =
  30. 30.247 + 58 =
  31. 31.86 + 18 =
  32. 32.411 + 59 =
  33. 33.181 + 98 =
  34. 34.114 + 28 =
  35. 35.210 + 69 =
  36. 36.125 + 78 =
  37. 37.95 + 88 =
  38. 38.208 + 39 =
  39. 39.50 + 68 =
  40. 40.431 + 98 =

Answer key

  1. 540
  2. 178
  3. 370
  4. 446
  5. 264
  6. 377
  7. 187
  8. 70
  9. 491
  10. 107
  11. 470
  12. 317
  13. 152
  14. 486
  15. 549
  16. 415
  17. 253
  18. 296
  19. 509
  20. 453
  21. 92
  22. 293
  23. 90
  24. 63
  25. 169
  26. 445
  27. 92
  28. 122
  29. 458
  30. 305
  31. 104
  32. 470
  33. 279
  34. 142
  35. 279
  36. 203
  37. 183
  38. 247
  39. 118
  40. 529

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