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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 523 · 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. 1.118 + 58 =
  2. 2.475 + 17 =
  3. 3.311 + 17 =
  4. 4.244 + 99 =
  5. 5.313 + 98 =
  6. 6.74 + 88 =
  7. 7.38 + 98 =
  8. 8.406 + 37 =
  9. 9.156 + 48 =
  10. 10.343 + 78 =
  11. 11.251 + 27 =
  12. 12.292 + 17 =
  13. 13.120 + 17 =
  14. 14.288 + 39 =
  15. 15.270 + 57 =
  16. 16.246 + 58 =
  17. 17.77 + 18 =
  18. 18.262 + 59 =
  19. 19.62 + 89 =
  20. 20.180 + 58 =
  21. 21.397 + 19 =
  22. 22.225 + 97 =
  23. 23.98 + 18 =
  24. 24.480 + 79 =
  25. 25.305 + 58 =
  26. 26.180 + 79 =
  27. 27.148 + 98 =
  28. 28.61 + 69 =
  29. 29.38 + 79 =
  30. 30.189 + 27 =
  31. 31.142 + 97 =
  32. 32.446 + 79 =
  33. 33.166 + 49 =
  34. 34.84 + 47 =
  35. 35.319 + 27 =
  36. 36.415 + 69 =
  37. 37.370 + 67 =
  38. 38.319 + 87 =
  39. 39.362 + 49 =
  40. 40.224 + 18 =

Answer key

  1. 176
  2. 492
  3. 328
  4. 343
  5. 411
  6. 162
  7. 136
  8. 443
  9. 204
  10. 421
  11. 278
  12. 309
  13. 137
  14. 327
  15. 327
  16. 304
  17. 95
  18. 321
  19. 151
  20. 238
  21. 416
  22. 322
  23. 116
  24. 559
  25. 363
  26. 259
  27. 246
  28. 130
  29. 117
  30. 216
  31. 239
  32. 525
  33. 215
  34. 131
  35. 346
  36. 484
  37. 437
  38. 406
  39. 411
  40. 242

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