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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 383 · 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. 1.317 + 39 =
  2. 2.94 + 28 =
  3. 3.438 + 27 =
  4. 4.322 + 68 =
  5. 5.344 + 18 =
  6. 6.139 + 69 =
  7. 7.265 + 17 =
  8. 8.289 + 67 =
  9. 9.144 + 99 =
  10. 10.80 + 97 =
  11. 11.345 + 37 =
  12. 12.72 + 27 =
  13. 13.191 + 37 =
  14. 14.484 + 77 =
  15. 15.381 + 28 =
  16. 16.79 + 27 =
  17. 17.289 + 28 =
  18. 18.297 + 98 =
  19. 19.400 + 58 =
  20. 20.275 + 69 =
  21. 21.69 + 79 =
  22. 22.105 + 48 =
  23. 23.396 + 78 =
  24. 24.134 + 27 =
  25. 25.289 + 77 =
  26. 26.120 + 69 =
  27. 27.341 + 67 =
  28. 28.457 + 87 =
  29. 29.66 + 37 =
  30. 30.466 + 67 =
  31. 31.324 + 67 =
  32. 32.85 + 58 =
  33. 33.132 + 87 =
  34. 34.144 + 19 =
  35. 35.310 + 37 =
  36. 36.390 + 79 =
  37. 37.319 + 78 =
  38. 38.193 + 17 =
  39. 39.149 + 88 =
  40. 40.213 + 17 =

Answer key

  1. 356
  2. 122
  3. 465
  4. 390
  5. 362
  6. 208
  7. 282
  8. 356
  9. 243
  10. 177
  11. 382
  12. 99
  13. 228
  14. 561
  15. 409
  16. 106
  17. 317
  18. 395
  19. 458
  20. 344
  21. 148
  22. 153
  23. 474
  24. 161
  25. 366
  26. 189
  27. 408
  28. 544
  29. 103
  30. 533
  31. 391
  32. 143
  33. 219
  34. 163
  35. 347
  36. 469
  37. 397
  38. 210
  39. 237
  40. 230

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