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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 751 · 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. 1.257 + 37 =
  2. 2.283 + 79 =
  3. 3.176 + 17 =
  4. 4.455 + 29 =
  5. 5.474 + 58 =
  6. 6.319 + 18 =
  7. 7.431 + 98 =
  8. 8.235 + 89 =
  9. 9.462 + 39 =
  10. 10.94 + 98 =
  11. 11.460 + 87 =
  12. 12.488 + 17 =
  13. 13.473 + 59 =
  14. 14.300 + 37 =
  15. 15.408 + 17 =
  16. 16.293 + 37 =
  17. 17.57 + 79 =
  18. 18.221 + 97 =
  19. 19.183 + 78 =
  20. 20.456 + 87 =
  21. 21.426 + 69 =
  22. 22.421 + 68 =
  23. 23.119 + 78 =
  24. 24.170 + 77 =
  25. 25.313 + 17 =
  26. 26.53 + 88 =
  27. 27.143 + 27 =
  28. 28.340 + 69 =
  29. 29.268 + 79 =
  30. 30.458 + 68 =
  31. 31.384 + 19 =
  32. 32.449 + 48 =
  33. 33.372 + 78 =
  34. 34.276 + 68 =
  35. 35.451 + 29 =
  36. 36.324 + 87 =
  37. 37.72 + 39 =
  38. 38.94 + 29 =
  39. 39.127 + 58 =
  40. 40.393 + 48 =

Answer key

  1. 294
  2. 362
  3. 193
  4. 484
  5. 532
  6. 337
  7. 529
  8. 324
  9. 501
  10. 192
  11. 547
  12. 505
  13. 532
  14. 337
  15. 425
  16. 330
  17. 136
  18. 318
  19. 261
  20. 543
  21. 495
  22. 489
  23. 197
  24. 247
  25. 330
  26. 141
  27. 170
  28. 409
  29. 347
  30. 526
  31. 403
  32. 497
  33. 450
  34. 344
  35. 480
  36. 411
  37. 111
  38. 123
  39. 185
  40. 441

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