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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 561 · 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. 1.161 + 57 =
  2. 2.82 + 78 =
  3. 3.379 + 88 =
  4. 4.204 + 27 =
  5. 5.344 + 19 =
  6. 6.354 + 19 =
  7. 7.71 + 59 =
  8. 8.213 + 57 =
  9. 9.140 + 77 =
  10. 10.422 + 89 =
  11. 11.235 + 47 =
  12. 12.376 + 57 =
  13. 13.111 + 77 =
  14. 14.196 + 48 =
  15. 15.376 + 67 =
  16. 16.454 + 58 =
  17. 17.357 + 37 =
  18. 18.159 + 99 =
  19. 19.51 + 67 =
  20. 20.475 + 18 =
  21. 21.28 + 78 =
  22. 22.335 + 58 =
  23. 23.109 + 69 =
  24. 24.110 + 68 =
  25. 25.335 + 17 =
  26. 26.415 + 67 =
  27. 27.290 + 18 =
  28. 28.105 + 38 =
  29. 29.365 + 97 =
  30. 30.407 + 77 =
  31. 31.335 + 97 =
  32. 32.373 + 59 =
  33. 33.144 + 27 =
  34. 34.182 + 29 =
  35. 35.334 + 17 =
  36. 36.385 + 27 =
  37. 37.34 + 68 =
  38. 38.196 + 98 =
  39. 39.397 + 59 =
  40. 40.127 + 88 =

Answer key

  1. 218
  2. 160
  3. 467
  4. 231
  5. 363
  6. 373
  7. 130
  8. 270
  9. 217
  10. 511
  11. 282
  12. 433
  13. 188
  14. 244
  15. 443
  16. 512
  17. 394
  18. 258
  19. 118
  20. 493
  21. 106
  22. 393
  23. 178
  24. 178
  25. 352
  26. 482
  27. 308
  28. 143
  29. 462
  30. 484
  31. 432
  32. 432
  33. 171
  34. 211
  35. 351
  36. 412
  37. 102
  38. 294
  39. 456
  40. 215

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