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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 281 · 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. 1.236 + 77 =
  2. 2.67 + 78 =
  3. 3.26 + 87 =
  4. 4.322 + 19 =
  5. 5.198 + 19 =
  6. 6.219 + 57 =
  7. 7.76 + 88 =
  8. 8.406 + 47 =
  9. 9.322 + 88 =
  10. 10.395 + 47 =
  11. 11.410 + 69 =
  12. 12.161 + 19 =
  13. 13.402 + 77 =
  14. 14.412 + 98 =
  15. 15.418 + 29 =
  16. 16.156 + 37 =
  17. 17.303 + 39 =
  18. 18.47 + 88 =
  19. 19.366 + 77 =
  20. 20.141 + 27 =
  21. 21.394 + 98 =
  22. 22.489 + 48 =
  23. 23.168 + 48 =
  24. 24.44 + 29 =
  25. 25.453 + 67 =
  26. 26.260 + 57 =
  27. 27.381 + 37 =
  28. 28.356 + 37 =
  29. 29.323 + 29 =
  30. 30.172 + 79 =
  31. 31.369 + 67 =
  32. 32.326 + 97 =
  33. 33.436 + 89 =
  34. 34.180 + 67 =
  35. 35.67 + 49 =
  36. 36.494 + 17 =
  37. 37.109 + 18 =
  38. 38.344 + 29 =
  39. 39.130 + 39 =
  40. 40.75 + 29 =

Answer key

  1. 313
  2. 145
  3. 113
  4. 341
  5. 217
  6. 276
  7. 164
  8. 453
  9. 410
  10. 442
  11. 479
  12. 180
  13. 479
  14. 510
  15. 447
  16. 193
  17. 342
  18. 135
  19. 443
  20. 168
  21. 492
  22. 537
  23. 216
  24. 73
  25. 520
  26. 317
  27. 418
  28. 393
  29. 352
  30. 251
  31. 436
  32. 423
  33. 525
  34. 247
  35. 116
  36. 511
  37. 127
  38. 373
  39. 169
  40. 104

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