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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 747 · 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. 1.381 + 29 =
  2. 2.356 + 29 =
  3. 3.65 + 68 =
  4. 4.370 + 78 =
  5. 5.410 + 59 =
  6. 6.186 + 27 =
  7. 7.116 + 57 =
  8. 8.422 + 68 =
  9. 9.225 + 49 =
  10. 10.70 + 99 =
  11. 11.327 + 57 =
  12. 12.286 + 87 =
  13. 13.40 + 47 =
  14. 14.183 + 37 =
  15. 15.37 + 27 =
  16. 16.53 + 38 =
  17. 17.449 + 39 =
  18. 18.423 + 59 =
  19. 19.251 + 38 =
  20. 20.316 + 37 =
  21. 21.308 + 57 =
  22. 22.127 + 99 =
  23. 23.412 + 19 =
  24. 24.395 + 97 =
  25. 25.422 + 58 =
  26. 26.361 + 39 =
  27. 27.349 + 69 =
  28. 28.329 + 39 =
  29. 29.365 + 97 =
  30. 30.256 + 69 =
  31. 31.112 + 18 =
  32. 32.369 + 97 =
  33. 33.343 + 49 =
  34. 34.301 + 49 =
  35. 35.109 + 17 =
  36. 36.424 + 47 =
  37. 37.104 + 79 =
  38. 38.75 + 38 =
  39. 39.142 + 97 =
  40. 40.370 + 17 =

Answer key

  1. 410
  2. 385
  3. 133
  4. 448
  5. 469
  6. 213
  7. 173
  8. 490
  9. 274
  10. 169
  11. 384
  12. 373
  13. 87
  14. 220
  15. 64
  16. 91
  17. 488
  18. 482
  19. 289
  20. 353
  21. 365
  22. 226
  23. 431
  24. 492
  25. 480
  26. 400
  27. 418
  28. 368
  29. 462
  30. 325
  31. 130
  32. 466
  33. 392
  34. 350
  35. 126
  36. 471
  37. 183
  38. 113
  39. 239
  40. 387

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