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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 203 · 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. 1.118 + 29 =
  2. 2.270 + 47 =
  3. 3.98 + 78 =
  4. 4.346 + 49 =
  5. 5.489 + 89 =
  6. 6.122 + 47 =
  7. 7.217 + 57 =
  8. 8.310 + 39 =
  9. 9.478 + 78 =
  10. 10.340 + 29 =
  11. 11.492 + 79 =
  12. 12.222 + 47 =
  13. 13.459 + 29 =
  14. 14.219 + 38 =
  15. 15.82 + 77 =
  16. 16.84 + 48 =
  17. 17.75 + 38 =
  18. 18.476 + 47 =
  19. 19.75 + 38 =
  20. 20.433 + 78 =
  21. 21.49 + 47 =
  22. 22.28 + 29 =
  23. 23.288 + 59 =
  24. 24.105 + 69 =
  25. 25.124 + 68 =
  26. 26.232 + 38 =
  27. 27.257 + 69 =
  28. 28.159 + 48 =
  29. 29.435 + 58 =
  30. 30.418 + 27 =
  31. 31.148 + 48 =
  32. 32.177 + 19 =
  33. 33.148 + 77 =
  34. 34.477 + 49 =
  35. 35.467 + 19 =
  36. 36.31 + 17 =
  37. 37.118 + 59 =
  38. 38.274 + 57 =
  39. 39.107 + 39 =
  40. 40.343 + 99 =

Answer key

  1. 147
  2. 317
  3. 176
  4. 395
  5. 578
  6. 169
  7. 274
  8. 349
  9. 556
  10. 369
  11. 571
  12. 269
  13. 488
  14. 257
  15. 159
  16. 132
  17. 113
  18. 523
  19. 113
  20. 511
  21. 96
  22. 57
  23. 347
  24. 174
  25. 192
  26. 270
  27. 326
  28. 207
  29. 493
  30. 445
  31. 196
  32. 196
  33. 225
  34. 526
  35. 486
  36. 48
  37. 177
  38. 331
  39. 146
  40. 442

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