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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 60 · 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. 1.366 + 57 =
  2. 2.257 + 79 =
  3. 3.101 + 37 =
  4. 4.214 + 87 =
  5. 5.240 + 58 =
  6. 6.119 + 27 =
  7. 7.65 + 39 =
  8. 8.243 + 37 =
  9. 9.67 + 87 =
  10. 10.285 + 37 =
  11. 11.129 + 87 =
  12. 12.200 + 17 =
  13. 13.365 + 67 =
  14. 14.189 + 28 =
  15. 15.57 + 87 =
  16. 16.120 + 48 =
  17. 17.344 + 77 =
  18. 18.142 + 29 =
  19. 19.156 + 27 =
  20. 20.150 + 48 =
  21. 21.439 + 79 =
  22. 22.459 + 47 =
  23. 23.110 + 17 =
  24. 24.488 + 89 =
  25. 25.51 + 88 =
  26. 26.166 + 29 =
  27. 27.303 + 47 =
  28. 28.44 + 57 =
  29. 29.463 + 89 =
  30. 30.355 + 17 =
  31. 31.64 + 68 =
  32. 32.453 + 49 =
  33. 33.187 + 29 =
  34. 34.231 + 48 =
  35. 35.47 + 47 =
  36. 36.296 + 39 =
  37. 37.37 + 39 =
  38. 38.436 + 38 =
  39. 39.101 + 87 =
  40. 40.480 + 57 =

Answer key

  1. 423
  2. 336
  3. 138
  4. 301
  5. 298
  6. 146
  7. 104
  8. 280
  9. 154
  10. 322
  11. 216
  12. 217
  13. 432
  14. 217
  15. 144
  16. 168
  17. 421
  18. 171
  19. 183
  20. 198
  21. 518
  22. 506
  23. 127
  24. 577
  25. 139
  26. 195
  27. 350
  28. 101
  29. 552
  30. 372
  31. 132
  32. 502
  33. 216
  34. 279
  35. 94
  36. 335
  37. 76
  38. 474
  39. 188
  40. 537

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