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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 91 · 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. 1.415 + 88 =
  2. 2.175 + 88 =
  3. 3.467 + 17 =
  4. 4.226 + 38 =
  5. 5.86 + 58 =
  6. 6.256 + 59 =
  7. 7.266 + 77 =
  8. 8.130 + 88 =
  9. 9.446 + 97 =
  10. 10.178 + 28 =
  11. 11.398 + 58 =
  12. 12.468 + 78 =
  13. 13.464 + 58 =
  14. 14.349 + 38 =
  15. 15.121 + 79 =
  16. 16.243 + 89 =
  17. 17.145 + 17 =
  18. 18.375 + 59 =
  19. 19.83 + 18 =
  20. 20.281 + 39 =
  21. 21.145 + 88 =
  22. 22.418 + 99 =
  23. 23.221 + 37 =
  24. 24.298 + 87 =
  25. 25.128 + 39 =
  26. 26.120 + 67 =
  27. 27.143 + 67 =
  28. 28.447 + 39 =
  29. 29.164 + 38 =
  30. 30.55 + 18 =
  31. 31.367 + 17 =
  32. 32.141 + 99 =
  33. 33.450 + 77 =
  34. 34.199 + 27 =
  35. 35.282 + 59 =
  36. 36.65 + 69 =
  37. 37.376 + 47 =
  38. 38.85 + 17 =
  39. 39.481 + 89 =
  40. 40.418 + 59 =

Answer key

  1. 503
  2. 263
  3. 484
  4. 264
  5. 144
  6. 315
  7. 343
  8. 218
  9. 543
  10. 206
  11. 456
  12. 546
  13. 522
  14. 387
  15. 200
  16. 332
  17. 162
  18. 434
  19. 101
  20. 320
  21. 233
  22. 517
  23. 258
  24. 385
  25. 167
  26. 187
  27. 210
  28. 486
  29. 202
  30. 73
  31. 384
  32. 240
  33. 527
  34. 226
  35. 341
  36. 134
  37. 423
  38. 102
  39. 570
  40. 477

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