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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 412 · 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. 1.271 + 77 =
  2. 2.36 + 38 =
  3. 3.219 + 77 =
  4. 4.259 + 59 =
  5. 5.177 + 58 =
  6. 6.242 + 28 =
  7. 7.208 + 89 =
  8. 8.241 + 98 =
  9. 9.466 + 27 =
  10. 10.222 + 19 =
  11. 11.349 + 48 =
  12. 12.112 + 17 =
  13. 13.152 + 19 =
  14. 14.147 + 27 =
  15. 15.46 + 59 =
  16. 16.449 + 29 =
  17. 17.291 + 29 =
  18. 18.126 + 97 =
  19. 19.202 + 18 =
  20. 20.273 + 59 =
  21. 21.208 + 17 =
  22. 22.333 + 39 =
  23. 23.419 + 77 =
  24. 24.473 + 29 =
  25. 25.348 + 99 =
  26. 26.114 + 97 =
  27. 27.242 + 59 =
  28. 28.122 + 48 =
  29. 29.55 + 59 =
  30. 30.185 + 28 =
  31. 31.190 + 27 =
  32. 32.116 + 27 =
  33. 33.204 + 89 =
  34. 34.153 + 27 =
  35. 35.25 + 87 =
  36. 36.151 + 39 =
  37. 37.218 + 97 =
  38. 38.236 + 58 =
  39. 39.178 + 28 =
  40. 40.188 + 17 =

Answer key

  1. 348
  2. 74
  3. 296
  4. 318
  5. 235
  6. 270
  7. 297
  8. 339
  9. 493
  10. 241
  11. 397
  12. 129
  13. 171
  14. 174
  15. 105
  16. 478
  17. 320
  18. 223
  19. 220
  20. 332
  21. 225
  22. 372
  23. 496
  24. 502
  25. 447
  26. 211
  27. 301
  28. 170
  29. 114
  30. 213
  31. 217
  32. 143
  33. 293
  34. 180
  35. 112
  36. 190
  37. 315
  38. 294
  39. 206
  40. 205

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