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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 537 · 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. 1.413 + 89 =
  2. 2.194 + 77 =
  3. 3.129 + 67 =
  4. 4.100 + 47 =
  5. 5.437 + 19 =
  6. 6.172 + 28 =
  7. 7.383 + 17 =
  8. 8.118 + 48 =
  9. 9.156 + 57 =
  10. 10.393 + 87 =
  11. 11.432 + 19 =
  12. 12.385 + 79 =
  13. 13.280 + 68 =
  14. 14.391 + 17 =
  15. 15.213 + 19 =
  16. 16.167 + 47 =
  17. 17.357 + 88 =
  18. 18.36 + 87 =
  19. 19.197 + 68 =
  20. 20.221 + 37 =
  21. 21.281 + 77 =
  22. 22.63 + 89 =
  23. 23.202 + 27 =
  24. 24.146 + 99 =
  25. 25.94 + 79 =
  26. 26.85 + 49 =
  27. 27.148 + 37 =
  28. 28.32 + 97 =
  29. 29.157 + 47 =
  30. 30.256 + 27 =
  31. 31.118 + 99 =
  32. 32.45 + 37 =
  33. 33.210 + 79 =
  34. 34.470 + 87 =
  35. 35.127 + 29 =
  36. 36.195 + 39 =
  37. 37.487 + 58 =
  38. 38.440 + 69 =
  39. 39.470 + 97 =
  40. 40.181 + 29 =

Answer key

  1. 502
  2. 271
  3. 196
  4. 147
  5. 456
  6. 200
  7. 400
  8. 166
  9. 213
  10. 480
  11. 451
  12. 464
  13. 348
  14. 408
  15. 232
  16. 214
  17. 445
  18. 123
  19. 265
  20. 258
  21. 358
  22. 152
  23. 229
  24. 245
  25. 173
  26. 134
  27. 185
  28. 129
  29. 204
  30. 283
  31. 217
  32. 82
  33. 289
  34. 557
  35. 156
  36. 234
  37. 545
  38. 509
  39. 567
  40. 210

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