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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 52 · 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. 1.325 + 78 =
  2. 2.316 + 29 =
  3. 3.33 + 49 =
  4. 4.428 + 97 =
  5. 5.161 + 17 =
  6. 6.419 + 17 =
  7. 7.472 + 58 =
  8. 8.250 + 89 =
  9. 9.221 + 37 =
  10. 10.109 + 18 =
  11. 11.208 + 49 =
  12. 12.172 + 58 =
  13. 13.43 + 28 =
  14. 14.236 + 87 =
  15. 15.377 + 79 =
  16. 16.154 + 28 =
  17. 17.338 + 99 =
  18. 18.357 + 77 =
  19. 19.143 + 68 =
  20. 20.348 + 28 =
  21. 21.46 + 47 =
  22. 22.234 + 78 =
  23. 23.137 + 19 =
  24. 24.300 + 29 =
  25. 25.395 + 39 =
  26. 26.367 + 27 =
  27. 27.145 + 97 =
  28. 28.178 + 98 =
  29. 29.282 + 87 =
  30. 30.182 + 78 =
  31. 31.151 + 69 =
  32. 32.373 + 28 =
  33. 33.324 + 18 =
  34. 34.267 + 57 =
  35. 35.120 + 29 =
  36. 36.369 + 59 =
  37. 37.210 + 17 =
  38. 38.121 + 58 =
  39. 39.347 + 97 =
  40. 40.406 + 88 =

Answer key

  1. 403
  2. 345
  3. 82
  4. 525
  5. 178
  6. 436
  7. 530
  8. 339
  9. 258
  10. 127
  11. 257
  12. 230
  13. 71
  14. 323
  15. 456
  16. 182
  17. 437
  18. 434
  19. 211
  20. 376
  21. 93
  22. 312
  23. 156
  24. 329
  25. 434
  26. 394
  27. 242
  28. 276
  29. 369
  30. 260
  31. 220
  32. 401
  33. 342
  34. 324
  35. 149
  36. 428
  37. 227
  38. 179
  39. 444
  40. 494

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