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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 349 · 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. 1.495 + 68 =
  2. 2.339 + 78 =
  3. 3.364 + 39 =
  4. 4.262 + 37 =
  5. 5.310 + 17 =
  6. 6.463 + 67 =
  7. 7.91 + 47 =
  8. 8.277 + 28 =
  9. 9.256 + 28 =
  10. 10.281 + 77 =
  11. 11.136 + 88 =
  12. 12.397 + 87 =
  13. 13.170 + 67 =
  14. 14.400 + 78 =
  15. 15.85 + 88 =
  16. 16.221 + 57 =
  17. 17.171 + 37 =
  18. 18.77 + 59 =
  19. 19.406 + 37 =
  20. 20.454 + 78 =
  21. 21.167 + 59 =
  22. 22.215 + 27 =
  23. 23.328 + 79 =
  24. 24.269 + 19 =
  25. 25.62 + 48 =
  26. 26.156 + 88 =
  27. 27.161 + 97 =
  28. 28.494 + 19 =
  29. 29.385 + 37 =
  30. 30.97 + 78 =
  31. 31.173 + 77 =
  32. 32.475 + 79 =
  33. 33.358 + 68 =
  34. 34.457 + 77 =
  35. 35.223 + 89 =
  36. 36.149 + 17 =
  37. 37.196 + 28 =
  38. 38.46 + 77 =
  39. 39.371 + 89 =
  40. 40.132 + 27 =

Answer key

  1. 563
  2. 417
  3. 403
  4. 299
  5. 327
  6. 530
  7. 138
  8. 305
  9. 284
  10. 358
  11. 224
  12. 484
  13. 237
  14. 478
  15. 173
  16. 278
  17. 208
  18. 136
  19. 443
  20. 532
  21. 226
  22. 242
  23. 407
  24. 288
  25. 110
  26. 244
  27. 258
  28. 513
  29. 422
  30. 175
  31. 250
  32. 554
  33. 426
  34. 534
  35. 312
  36. 166
  37. 224
  38. 123
  39. 460
  40. 159

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