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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 127 · 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. 1.44 + 47 =
  2. 2.194 + 69 =
  3. 3.448 + 38 =
  4. 4.299 + 29 =
  5. 5.209 + 99 =
  6. 6.332 + 28 =
  7. 7.59 + 49 =
  8. 8.70 + 69 =
  9. 9.226 + 17 =
  10. 10.482 + 28 =
  11. 11.322 + 59 =
  12. 12.127 + 49 =
  13. 13.322 + 38 =
  14. 14.199 + 39 =
  15. 15.60 + 87 =
  16. 16.303 + 29 =
  17. 17.286 + 29 =
  18. 18.253 + 89 =
  19. 19.474 + 49 =
  20. 20.382 + 18 =
  21. 21.125 + 27 =
  22. 22.279 + 67 =
  23. 23.390 + 67 =
  24. 24.332 + 99 =
  25. 25.336 + 77 =
  26. 26.470 + 48 =
  27. 27.396 + 99 =
  28. 28.278 + 48 =
  29. 29.94 + 17 =
  30. 30.72 + 48 =
  31. 31.458 + 18 =
  32. 32.103 + 78 =
  33. 33.61 + 78 =
  34. 34.172 + 29 =
  35. 35.355 + 97 =
  36. 36.162 + 87 =
  37. 37.140 + 17 =
  38. 38.478 + 67 =
  39. 39.269 + 89 =
  40. 40.231 + 27 =

Answer key

  1. 91
  2. 263
  3. 486
  4. 328
  5. 308
  6. 360
  7. 108
  8. 139
  9. 243
  10. 510
  11. 381
  12. 176
  13. 360
  14. 238
  15. 147
  16. 332
  17. 315
  18. 342
  19. 523
  20. 400
  21. 152
  22. 346
  23. 457
  24. 431
  25. 413
  26. 518
  27. 495
  28. 326
  29. 111
  30. 120
  31. 476
  32. 181
  33. 139
  34. 201
  35. 452
  36. 249
  37. 157
  38. 545
  39. 358
  40. 258

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