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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 565 · 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. 1.322 + 99 =
  2. 2.392 + 57 =
  3. 3.216 + 98 =
  4. 4.195 + 47 =
  5. 5.473 + 48 =
  6. 6.349 + 37 =
  7. 7.354 + 49 =
  8. 8.409 + 19 =
  9. 9.120 + 69 =
  10. 10.399 + 97 =
  11. 11.99 + 48 =
  12. 12.347 + 68 =
  13. 13.385 + 97 =
  14. 14.206 + 67 =
  15. 15.327 + 89 =
  16. 16.297 + 79 =
  17. 17.450 + 89 =
  18. 18.326 + 48 =
  19. 19.399 + 79 =
  20. 20.103 + 87 =
  21. 21.370 + 49 =
  22. 22.219 + 67 =
  23. 23.180 + 17 =
  24. 24.234 + 79 =
  25. 25.59 + 59 =
  26. 26.41 + 57 =
  27. 27.34 + 39 =
  28. 28.159 + 17 =
  29. 29.58 + 58 =
  30. 30.155 + 69 =
  31. 31.40 + 29 =
  32. 32.431 + 97 =
  33. 33.370 + 39 =
  34. 34.104 + 78 =
  35. 35.37 + 39 =
  36. 36.96 + 29 =
  37. 37.248 + 29 =
  38. 38.282 + 78 =
  39. 39.27 + 87 =
  40. 40.321 + 88 =

Answer key

  1. 421
  2. 449
  3. 314
  4. 242
  5. 521
  6. 386
  7. 403
  8. 428
  9. 189
  10. 496
  11. 147
  12. 415
  13. 482
  14. 273
  15. 416
  16. 376
  17. 539
  18. 374
  19. 478
  20. 190
  21. 419
  22. 286
  23. 197
  24. 313
  25. 118
  26. 98
  27. 73
  28. 176
  29. 116
  30. 224
  31. 69
  32. 528
  33. 409
  34. 182
  35. 76
  36. 125
  37. 277
  38. 360
  39. 114
  40. 409

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