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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 435 · 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. 1.282 + 88 =
  2. 2.160 + 27 =
  3. 3.278 + 29 =
  4. 4.173 + 28 =
  5. 5.242 + 88 =
  6. 6.218 + 18 =
  7. 7.153 + 67 =
  8. 8.193 + 59 =
  9. 9.256 + 49 =
  10. 10.415 + 99 =
  11. 11.82 + 37 =
  12. 12.61 + 39 =
  13. 13.319 + 18 =
  14. 14.317 + 79 =
  15. 15.84 + 79 =
  16. 16.437 + 29 =
  17. 17.443 + 68 =
  18. 18.263 + 57 =
  19. 19.240 + 38 =
  20. 20.417 + 78 =
  21. 21.154 + 67 =
  22. 22.214 + 19 =
  23. 23.448 + 29 =
  24. 24.46 + 99 =
  25. 25.237 + 67 =
  26. 26.85 + 87 =
  27. 27.385 + 49 =
  28. 28.263 + 29 =
  29. 29.298 + 87 =
  30. 30.359 + 59 =
  31. 31.105 + 47 =
  32. 32.399 + 98 =
  33. 33.426 + 17 =
  34. 34.224 + 39 =
  35. 35.158 + 19 =
  36. 36.164 + 59 =
  37. 37.475 + 38 =
  38. 38.35 + 38 =
  39. 39.134 + 89 =
  40. 40.48 + 27 =

Answer key

  1. 370
  2. 187
  3. 307
  4. 201
  5. 330
  6. 236
  7. 220
  8. 252
  9. 305
  10. 514
  11. 119
  12. 100
  13. 337
  14. 396
  15. 163
  16. 466
  17. 511
  18. 320
  19. 278
  20. 495
  21. 221
  22. 233
  23. 477
  24. 145
  25. 304
  26. 172
  27. 434
  28. 292
  29. 385
  30. 418
  31. 152
  32. 497
  33. 443
  34. 263
  35. 177
  36. 223
  37. 513
  38. 73
  39. 223
  40. 75

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