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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 620 · 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. 1.303 + 57 =
  2. 2.372 + 97 =
  3. 3.328 + 89 =
  4. 4.112 + 67 =
  5. 5.106 + 58 =
  6. 6.351 + 69 =
  7. 7.282 + 28 =
  8. 8.229 + 67 =
  9. 9.290 + 67 =
  10. 10.321 + 87 =
  11. 11.361 + 48 =
  12. 12.223 + 39 =
  13. 13.288 + 79 =
  14. 14.298 + 28 =
  15. 15.265 + 47 =
  16. 16.63 + 17 =
  17. 17.38 + 58 =
  18. 18.81 + 58 =
  19. 19.317 + 48 =
  20. 20.217 + 37 =
  21. 21.224 + 37 =
  22. 22.104 + 98 =
  23. 23.302 + 68 =
  24. 24.259 + 99 =
  25. 25.115 + 29 =
  26. 26.385 + 17 =
  27. 27.317 + 29 =
  28. 28.498 + 29 =
  29. 29.287 + 98 =
  30. 30.322 + 78 =
  31. 31.260 + 57 =
  32. 32.289 + 79 =
  33. 33.447 + 68 =
  34. 34.187 + 17 =
  35. 35.123 + 19 =
  36. 36.155 + 39 =
  37. 37.405 + 89 =
  38. 38.470 + 89 =
  39. 39.406 + 39 =
  40. 40.387 + 39 =

Answer key

  1. 360
  2. 469
  3. 417
  4. 179
  5. 164
  6. 420
  7. 310
  8. 296
  9. 357
  10. 408
  11. 409
  12. 262
  13. 367
  14. 326
  15. 312
  16. 80
  17. 96
  18. 139
  19. 365
  20. 254
  21. 261
  22. 202
  23. 370
  24. 358
  25. 144
  26. 402
  27. 346
  28. 527
  29. 385
  30. 400
  31. 317
  32. 368
  33. 515
  34. 204
  35. 142
  36. 194
  37. 494
  38. 559
  39. 445
  40. 426

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