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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 566 · 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. 1.129 + 49 =
  2. 2.58 + 29 =
  3. 3.406 + 48 =
  4. 4.466 + 58 =
  5. 5.216 + 68 =
  6. 6.126 + 67 =
  7. 7.369 + 17 =
  8. 8.97 + 79 =
  9. 9.249 + 18 =
  10. 10.154 + 99 =
  11. 11.51 + 57 =
  12. 12.69 + 69 =
  13. 13.186 + 47 =
  14. 14.174 + 47 =
  15. 15.398 + 28 =
  16. 16.478 + 27 =
  17. 17.447 + 79 =
  18. 18.430 + 27 =
  19. 19.469 + 77 =
  20. 20.235 + 19 =
  21. 21.495 + 47 =
  22. 22.217 + 98 =
  23. 23.39 + 67 =
  24. 24.63 + 18 =
  25. 25.352 + 77 =
  26. 26.387 + 97 =
  27. 27.39 + 29 =
  28. 28.296 + 88 =
  29. 29.285 + 27 =
  30. 30.196 + 28 =
  31. 31.440 + 88 =
  32. 32.140 + 18 =
  33. 33.226 + 47 =
  34. 34.406 + 68 =
  35. 35.386 + 77 =
  36. 36.348 + 49 =
  37. 37.322 + 77 =
  38. 38.27 + 89 =
  39. 39.89 + 59 =
  40. 40.427 + 19 =

Answer key

  1. 178
  2. 87
  3. 454
  4. 524
  5. 284
  6. 193
  7. 386
  8. 176
  9. 267
  10. 253
  11. 108
  12. 138
  13. 233
  14. 221
  15. 426
  16. 505
  17. 526
  18. 457
  19. 546
  20. 254
  21. 542
  22. 315
  23. 106
  24. 81
  25. 429
  26. 484
  27. 68
  28. 384
  29. 312
  30. 224
  31. 528
  32. 158
  33. 273
  34. 474
  35. 463
  36. 397
  37. 399
  38. 116
  39. 148
  40. 446

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