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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 617 · 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. 1.332 + 88 =
  2. 2.396 + 28 =
  3. 3.79 + 89 =
  4. 4.77 + 67 =
  5. 5.432 + 59 =
  6. 6.70 + 47 =
  7. 7.30 + 77 =
  8. 8.131 + 27 =
  9. 9.126 + 39 =
  10. 10.88 + 19 =
  11. 11.77 + 69 =
  12. 12.404 + 28 =
  13. 13.256 + 18 =
  14. 14.182 + 58 =
  15. 15.71 + 59 =
  16. 16.461 + 47 =
  17. 17.78 + 77 =
  18. 18.186 + 18 =
  19. 19.38 + 59 =
  20. 20.223 + 18 =
  21. 21.330 + 89 =
  22. 22.105 + 97 =
  23. 23.198 + 89 =
  24. 24.226 + 97 =
  25. 25.277 + 27 =
  26. 26.43 + 37 =
  27. 27.254 + 38 =
  28. 28.363 + 28 =
  29. 29.445 + 57 =
  30. 30.111 + 87 =
  31. 31.113 + 49 =
  32. 32.301 + 48 =
  33. 33.136 + 78 =
  34. 34.243 + 78 =
  35. 35.181 + 58 =
  36. 36.180 + 79 =
  37. 37.303 + 98 =
  38. 38.383 + 68 =
  39. 39.406 + 78 =
  40. 40.365 + 68 =

Answer key

  1. 420
  2. 424
  3. 168
  4. 144
  5. 491
  6. 117
  7. 107
  8. 158
  9. 165
  10. 107
  11. 146
  12. 432
  13. 274
  14. 240
  15. 130
  16. 508
  17. 155
  18. 204
  19. 97
  20. 241
  21. 419
  22. 202
  23. 287
  24. 323
  25. 304
  26. 80
  27. 292
  28. 391
  29. 502
  30. 198
  31. 162
  32. 349
  33. 214
  34. 321
  35. 239
  36. 259
  37. 401
  38. 451
  39. 484
  40. 433

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