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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 56 · 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. 1.122 + 27 =
  2. 2.344 + 67 =
  3. 3.166 + 69 =
  4. 4.123 + 17 =
  5. 5.413 + 89 =
  6. 6.372 + 58 =
  7. 7.144 + 39 =
  8. 8.152 + 37 =
  9. 9.436 + 98 =
  10. 10.494 + 67 =
  11. 11.255 + 99 =
  12. 12.258 + 68 =
  13. 13.427 + 28 =
  14. 14.175 + 67 =
  15. 15.155 + 67 =
  16. 16.86 + 49 =
  17. 17.360 + 97 =
  18. 18.138 + 57 =
  19. 19.342 + 57 =
  20. 20.498 + 67 =
  21. 21.450 + 78 =
  22. 22.143 + 27 =
  23. 23.48 + 87 =
  24. 24.440 + 27 =
  25. 25.483 + 17 =
  26. 26.470 + 99 =
  27. 27.265 + 98 =
  28. 28.230 + 27 =
  29. 29.340 + 37 =
  30. 30.224 + 78 =
  31. 31.275 + 37 =
  32. 32.446 + 97 =
  33. 33.198 + 18 =
  34. 34.452 + 68 =
  35. 35.27 + 27 =
  36. 36.43 + 49 =
  37. 37.371 + 68 =
  38. 38.192 + 77 =
  39. 39.315 + 38 =
  40. 40.302 + 69 =

Answer key

  1. 149
  2. 411
  3. 235
  4. 140
  5. 502
  6. 430
  7. 183
  8. 189
  9. 534
  10. 561
  11. 354
  12. 326
  13. 455
  14. 242
  15. 222
  16. 135
  17. 457
  18. 195
  19. 399
  20. 565
  21. 528
  22. 170
  23. 135
  24. 467
  25. 500
  26. 569
  27. 363
  28. 257
  29. 377
  30. 302
  31. 312
  32. 543
  33. 216
  34. 520
  35. 54
  36. 92
  37. 439
  38. 269
  39. 353
  40. 371

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