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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 593 · 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. 1.327 + 77 =
  2. 2.377 + 17 =
  3. 3.202 + 68 =
  4. 4.350 + 67 =
  5. 5.241 + 18 =
  6. 6.461 + 38 =
  7. 7.387 + 89 =
  8. 8.177 + 98 =
  9. 9.295 + 77 =
  10. 10.396 + 87 =
  11. 11.195 + 77 =
  12. 12.342 + 88 =
  13. 13.42 + 97 =
  14. 14.115 + 97 =
  15. 15.415 + 28 =
  16. 16.59 + 78 =
  17. 17.333 + 58 =
  18. 18.50 + 78 =
  19. 19.107 + 28 =
  20. 20.385 + 37 =
  21. 21.105 + 17 =
  22. 22.498 + 27 =
  23. 23.92 + 49 =
  24. 24.451 + 88 =
  25. 25.150 + 47 =
  26. 26.148 + 69 =
  27. 27.96 + 27 =
  28. 28.190 + 28 =
  29. 29.170 + 89 =
  30. 30.112 + 57 =
  31. 31.228 + 68 =
  32. 32.211 + 38 =
  33. 33.148 + 27 =
  34. 34.86 + 49 =
  35. 35.279 + 49 =
  36. 36.160 + 39 =
  37. 37.478 + 87 =
  38. 38.454 + 97 =
  39. 39.92 + 49 =
  40. 40.50 + 17 =

Answer key

  1. 404
  2. 394
  3. 270
  4. 417
  5. 259
  6. 499
  7. 476
  8. 275
  9. 372
  10. 483
  11. 272
  12. 430
  13. 139
  14. 212
  15. 443
  16. 137
  17. 391
  18. 128
  19. 135
  20. 422
  21. 122
  22. 525
  23. 141
  24. 539
  25. 197
  26. 217
  27. 123
  28. 218
  29. 259
  30. 169
  31. 296
  32. 249
  33. 175
  34. 135
  35. 328
  36. 199
  37. 565
  38. 551
  39. 141
  40. 67

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