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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 213 · 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. 1.115 + 27 =
  2. 2.295 + 79 =
  3. 3.377 + 87 =
  4. 4.294 + 89 =
  5. 5.461 + 17 =
  6. 6.313 + 58 =
  7. 7.65 + 39 =
  8. 8.347 + 98 =
  9. 9.443 + 47 =
  10. 10.122 + 18 =
  11. 11.92 + 37 =
  12. 12.353 + 27 =
  13. 13.113 + 38 =
  14. 14.108 + 98 =
  15. 15.147 + 37 =
  16. 16.44 + 29 =
  17. 17.156 + 99 =
  18. 18.302 + 67 =
  19. 19.189 + 17 =
  20. 20.391 + 37 =
  21. 21.356 + 37 =
  22. 22.248 + 59 =
  23. 23.269 + 58 =
  24. 24.185 + 19 =
  25. 25.107 + 58 =
  26. 26.43 + 79 =
  27. 27.406 + 99 =
  28. 28.159 + 49 =
  29. 29.43 + 47 =
  30. 30.268 + 49 =
  31. 31.176 + 78 =
  32. 32.483 + 17 =
  33. 33.187 + 57 =
  34. 34.239 + 19 =
  35. 35.70 + 29 =
  36. 36.246 + 77 =
  37. 37.91 + 17 =
  38. 38.370 + 48 =
  39. 39.143 + 67 =
  40. 40.69 + 19 =

Answer key

  1. 142
  2. 374
  3. 464
  4. 383
  5. 478
  6. 371
  7. 104
  8. 445
  9. 490
  10. 140
  11. 129
  12. 380
  13. 151
  14. 206
  15. 184
  16. 73
  17. 255
  18. 369
  19. 206
  20. 428
  21. 393
  22. 307
  23. 327
  24. 204
  25. 165
  26. 122
  27. 505
  28. 208
  29. 90
  30. 317
  31. 254
  32. 500
  33. 244
  34. 258
  35. 99
  36. 323
  37. 108
  38. 418
  39. 210
  40. 88

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