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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 705 · 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. 1.479 + 87 =
  2. 2.281 + 69 =
  3. 3.275 + 39 =
  4. 4.369 + 78 =
  5. 5.289 + 77 =
  6. 6.49 + 57 =
  7. 7.38 + 78 =
  8. 8.25 + 77 =
  9. 9.271 + 88 =
  10. 10.110 + 29 =
  11. 11.144 + 58 =
  12. 12.103 + 77 =
  13. 13.383 + 27 =
  14. 14.168 + 58 =
  15. 15.164 + 97 =
  16. 16.76 + 17 =
  17. 17.59 + 59 =
  18. 18.387 + 87 =
  19. 19.302 + 87 =
  20. 20.499 + 39 =
  21. 21.132 + 57 =
  22. 22.163 + 38 =
  23. 23.78 + 57 =
  24. 24.139 + 78 =
  25. 25.106 + 69 =
  26. 26.286 + 17 =
  27. 27.496 + 29 =
  28. 28.496 + 68 =
  29. 29.255 + 48 =
  30. 30.97 + 59 =
  31. 31.336 + 68 =
  32. 32.402 + 29 =
  33. 33.95 + 88 =
  34. 34.112 + 27 =
  35. 35.44 + 69 =
  36. 36.327 + 98 =
  37. 37.245 + 49 =
  38. 38.114 + 49 =
  39. 39.135 + 28 =
  40. 40.129 + 59 =

Answer key

  1. 566
  2. 350
  3. 314
  4. 447
  5. 366
  6. 106
  7. 116
  8. 102
  9. 359
  10. 139
  11. 202
  12. 180
  13. 410
  14. 226
  15. 261
  16. 93
  17. 118
  18. 474
  19. 389
  20. 538
  21. 189
  22. 201
  23. 135
  24. 217
  25. 175
  26. 303
  27. 525
  28. 564
  29. 303
  30. 156
  31. 404
  32. 431
  33. 183
  34. 139
  35. 113
  36. 425
  37. 294
  38. 163
  39. 163
  40. 188

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