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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 496 · 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. 1.157 + 29 =
  2. 2.98 + 69 =
  3. 3.207 + 59 =
  4. 4.252 + 18 =
  5. 5.148 + 27 =
  6. 6.115 + 67 =
  7. 7.92 + 38 =
  8. 8.454 + 27 =
  9. 9.183 + 27 =
  10. 10.433 + 68 =
  11. 11.443 + 78 =
  12. 12.454 + 57 =
  13. 13.156 + 97 =
  14. 14.357 + 98 =
  15. 15.92 + 69 =
  16. 16.324 + 79 =
  17. 17.202 + 39 =
  18. 18.326 + 39 =
  19. 19.176 + 19 =
  20. 20.221 + 87 =
  21. 21.444 + 57 =
  22. 22.251 + 17 =
  23. 23.110 + 19 =
  24. 24.316 + 59 =
  25. 25.63 + 78 =
  26. 26.407 + 29 =
  27. 27.400 + 17 =
  28. 28.154 + 57 =
  29. 29.256 + 48 =
  30. 30.131 + 88 =
  31. 31.388 + 27 =
  32. 32.231 + 77 =
  33. 33.91 + 48 =
  34. 34.201 + 88 =
  35. 35.301 + 99 =
  36. 36.431 + 17 =
  37. 37.488 + 78 =
  38. 38.62 + 27 =
  39. 39.97 + 38 =
  40. 40.202 + 68 =

Answer key

  1. 186
  2. 167
  3. 266
  4. 270
  5. 175
  6. 182
  7. 130
  8. 481
  9. 210
  10. 501
  11. 521
  12. 511
  13. 253
  14. 455
  15. 161
  16. 403
  17. 241
  18. 365
  19. 195
  20. 308
  21. 501
  22. 268
  23. 129
  24. 375
  25. 141
  26. 436
  27. 417
  28. 211
  29. 304
  30. 219
  31. 415
  32. 308
  33. 139
  34. 289
  35. 400
  36. 448
  37. 566
  38. 89
  39. 135
  40. 270

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