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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 14 · 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. 1.484 + 68 =
  2. 2.403 + 27 =
  3. 3.198 + 27 =
  4. 4.321 + 38 =
  5. 5.26 + 38 =
  6. 6.451 + 39 =
  7. 7.48 + 39 =
  8. 8.343 + 38 =
  9. 9.283 + 58 =
  10. 10.32 + 97 =
  11. 11.77 + 49 =
  12. 12.214 + 59 =
  13. 13.36 + 37 =
  14. 14.39 + 17 =
  15. 15.273 + 38 =
  16. 16.365 + 78 =
  17. 17.444 + 67 =
  18. 18.119 + 38 =
  19. 19.264 + 38 =
  20. 20.360 + 87 =
  21. 21.457 + 89 =
  22. 22.145 + 78 =
  23. 23.121 + 37 =
  24. 24.374 + 48 =
  25. 25.408 + 88 =
  26. 26.467 + 38 =
  27. 27.202 + 17 =
  28. 28.96 + 87 =
  29. 29.483 + 58 =
  30. 30.90 + 97 =
  31. 31.173 + 68 =
  32. 32.257 + 98 =
  33. 33.475 + 19 =
  34. 34.117 + 78 =
  35. 35.72 + 37 =
  36. 36.40 + 19 =
  37. 37.209 + 37 =
  38. 38.208 + 38 =
  39. 39.366 + 38 =
  40. 40.131 + 19 =

Answer key

  1. 552
  2. 430
  3. 225
  4. 359
  5. 64
  6. 490
  7. 87
  8. 381
  9. 341
  10. 129
  11. 126
  12. 273
  13. 73
  14. 56
  15. 311
  16. 443
  17. 511
  18. 157
  19. 302
  20. 447
  21. 546
  22. 223
  23. 158
  24. 422
  25. 496
  26. 505
  27. 219
  28. 183
  29. 541
  30. 187
  31. 241
  32. 355
  33. 494
  34. 195
  35. 109
  36. 59
  37. 246
  38. 246
  39. 404
  40. 150

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