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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 166 · 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. 1.76 + 97 =
  2. 2.141 + 99 =
  3. 3.52 + 57 =
  4. 4.185 + 28 =
  5. 5.314 + 48 =
  6. 6.394 + 59 =
  7. 7.170 + 18 =
  8. 8.124 + 97 =
  9. 9.457 + 77 =
  10. 10.251 + 18 =
  11. 11.377 + 57 =
  12. 12.390 + 88 =
  13. 13.257 + 59 =
  14. 14.280 + 39 =
  15. 15.218 + 49 =
  16. 16.82 + 19 =
  17. 17.268 + 98 =
  18. 18.277 + 27 =
  19. 19.387 + 67 =
  20. 20.123 + 97 =
  21. 21.118 + 97 =
  22. 22.319 + 27 =
  23. 23.41 + 68 =
  24. 24.156 + 67 =
  25. 25.390 + 19 =
  26. 26.228 + 57 =
  27. 27.268 + 59 =
  28. 28.416 + 57 =
  29. 29.62 + 57 =
  30. 30.250 + 18 =
  31. 31.73 + 58 =
  32. 32.146 + 79 =
  33. 33.447 + 19 =
  34. 34.246 + 17 =
  35. 35.371 + 47 =
  36. 36.44 + 88 =
  37. 37.445 + 99 =
  38. 38.28 + 29 =
  39. 39.114 + 17 =
  40. 40.51 + 48 =

Answer key

  1. 173
  2. 240
  3. 109
  4. 213
  5. 362
  6. 453
  7. 188
  8. 221
  9. 534
  10. 269
  11. 434
  12. 478
  13. 316
  14. 319
  15. 267
  16. 101
  17. 366
  18. 304
  19. 454
  20. 220
  21. 215
  22. 346
  23. 109
  24. 223
  25. 409
  26. 285
  27. 327
  28. 473
  29. 119
  30. 268
  31. 131
  32. 225
  33. 466
  34. 263
  35. 418
  36. 132
  37. 544
  38. 57
  39. 131
  40. 99

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