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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 632 · 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. 1.311 + 17 =
  2. 2.116 + 89 =
  3. 3.94 + 19 =
  4. 4.147 + 77 =
  5. 5.170 + 39 =
  6. 6.191 + 97 =
  7. 7.485 + 97 =
  8. 8.285 + 27 =
  9. 9.55 + 39 =
  10. 10.170 + 98 =
  11. 11.299 + 68 =
  12. 12.303 + 39 =
  13. 13.259 + 18 =
  14. 14.449 + 17 =
  15. 15.305 + 37 =
  16. 16.432 + 38 =
  17. 17.182 + 88 =
  18. 18.269 + 97 =
  19. 19.314 + 47 =
  20. 20.61 + 77 =
  21. 21.439 + 27 =
  22. 22.434 + 49 =
  23. 23.63 + 89 =
  24. 24.186 + 98 =
  25. 25.75 + 17 =
  26. 26.108 + 58 =
  27. 27.75 + 79 =
  28. 28.64 + 18 =
  29. 29.85 + 58 =
  30. 30.469 + 88 =
  31. 31.366 + 69 =
  32. 32.250 + 29 =
  33. 33.139 + 17 =
  34. 34.302 + 19 =
  35. 35.197 + 59 =
  36. 36.463 + 57 =
  37. 37.422 + 17 =
  38. 38.459 + 68 =
  39. 39.345 + 18 =
  40. 40.214 + 29 =

Answer key

  1. 328
  2. 205
  3. 113
  4. 224
  5. 209
  6. 288
  7. 582
  8. 312
  9. 94
  10. 268
  11. 367
  12. 342
  13. 277
  14. 466
  15. 342
  16. 470
  17. 270
  18. 366
  19. 361
  20. 138
  21. 466
  22. 483
  23. 152
  24. 284
  25. 92
  26. 166
  27. 154
  28. 82
  29. 143
  30. 557
  31. 435
  32. 279
  33. 156
  34. 321
  35. 256
  36. 520
  37. 439
  38. 527
  39. 363
  40. 243

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