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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 718 · 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. 1.77 + 87 =
  2. 2.316 + 48 =
  3. 3.463 + 79 =
  4. 4.306 + 78 =
  5. 5.150 + 79 =
  6. 6.445 + 99 =
  7. 7.62 + 18 =
  8. 8.326 + 49 =
  9. 9.116 + 28 =
  10. 10.354 + 29 =
  11. 11.159 + 27 =
  12. 12.352 + 67 =
  13. 13.302 + 28 =
  14. 14.443 + 69 =
  15. 15.102 + 19 =
  16. 16.90 + 28 =
  17. 17.410 + 17 =
  18. 18.395 + 27 =
  19. 19.360 + 47 =
  20. 20.192 + 99 =
  21. 21.326 + 28 =
  22. 22.163 + 29 =
  23. 23.310 + 57 =
  24. 24.264 + 48 =
  25. 25.363 + 78 =
  26. 26.84 + 89 =
  27. 27.408 + 68 =
  28. 28.365 + 29 =
  29. 29.258 + 97 =
  30. 30.138 + 57 =
  31. 31.36 + 48 =
  32. 32.386 + 89 =
  33. 33.365 + 57 =
  34. 34.55 + 49 =
  35. 35.226 + 48 =
  36. 36.218 + 98 =
  37. 37.338 + 29 =
  38. 38.413 + 79 =
  39. 39.232 + 37 =
  40. 40.299 + 69 =

Answer key

  1. 164
  2. 364
  3. 542
  4. 384
  5. 229
  6. 544
  7. 80
  8. 375
  9. 144
  10. 383
  11. 186
  12. 419
  13. 330
  14. 512
  15. 121
  16. 118
  17. 427
  18. 422
  19. 407
  20. 291
  21. 354
  22. 192
  23. 367
  24. 312
  25. 441
  26. 173
  27. 476
  28. 394
  29. 355
  30. 195
  31. 84
  32. 475
  33. 422
  34. 104
  35. 274
  36. 316
  37. 367
  38. 492
  39. 269
  40. 368

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