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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 106 · 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. 1.261 + 68 =
  2. 2.97 + 99 =
  3. 3.411 + 57 =
  4. 4.226 + 87 =
  5. 5.258 + 98 =
  6. 6.324 + 78 =
  7. 7.175 + 97 =
  8. 8.143 + 37 =
  9. 9.379 + 78 =
  10. 10.145 + 68 =
  11. 11.311 + 99 =
  12. 12.426 + 39 =
  13. 13.279 + 69 =
  14. 14.116 + 49 =
  15. 15.458 + 88 =
  16. 16.152 + 47 =
  17. 17.492 + 17 =
  18. 18.417 + 19 =
  19. 19.319 + 47 =
  20. 20.254 + 19 =
  21. 21.326 + 19 =
  22. 22.238 + 99 =
  23. 23.393 + 99 =
  24. 24.357 + 49 =
  25. 25.479 + 88 =
  26. 26.110 + 29 =
  27. 27.192 + 17 =
  28. 28.91 + 49 =
  29. 29.322 + 59 =
  30. 30.352 + 47 =
  31. 31.197 + 58 =
  32. 32.99 + 67 =
  33. 33.87 + 29 =
  34. 34.492 + 78 =
  35. 35.418 + 37 =
  36. 36.288 + 38 =
  37. 37.250 + 38 =
  38. 38.98 + 59 =
  39. 39.462 + 38 =
  40. 40.478 + 67 =

Answer key

  1. 329
  2. 196
  3. 468
  4. 313
  5. 356
  6. 402
  7. 272
  8. 180
  9. 457
  10. 213
  11. 410
  12. 465
  13. 348
  14. 165
  15. 546
  16. 199
  17. 509
  18. 436
  19. 366
  20. 273
  21. 345
  22. 337
  23. 492
  24. 406
  25. 567
  26. 139
  27. 209
  28. 140
  29. 381
  30. 399
  31. 255
  32. 166
  33. 116
  34. 570
  35. 455
  36. 326
  37. 288
  38. 157
  39. 500
  40. 545

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