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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 762 · 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. 1.229 + 48 =
  2. 2.245 + 58 =
  3. 3.283 + 98 =
  4. 4.486 + 18 =
  5. 5.125 + 29 =
  6. 6.460 + 47 =
  7. 7.131 + 17 =
  8. 8.163 + 39 =
  9. 9.263 + 49 =
  10. 10.28 + 28 =
  11. 11.119 + 28 =
  12. 12.350 + 37 =
  13. 13.86 + 97 =
  14. 14.48 + 97 =
  15. 15.391 + 18 =
  16. 16.251 + 28 =
  17. 17.43 + 48 =
  18. 18.137 + 67 =
  19. 19.487 + 68 =
  20. 20.265 + 38 =
  21. 21.131 + 98 =
  22. 22.386 + 47 =
  23. 23.463 + 97 =
  24. 24.386 + 19 =
  25. 25.138 + 18 =
  26. 26.102 + 19 =
  27. 27.133 + 27 =
  28. 28.333 + 38 =
  29. 29.395 + 18 =
  30. 30.463 + 19 =
  31. 31.51 + 17 =
  32. 32.312 + 38 =
  33. 33.313 + 37 =
  34. 34.163 + 19 =
  35. 35.143 + 78 =
  36. 36.188 + 29 =
  37. 37.474 + 28 =
  38. 38.25 + 99 =
  39. 39.392 + 67 =
  40. 40.304 + 49 =

Answer key

  1. 277
  2. 303
  3. 381
  4. 504
  5. 154
  6. 507
  7. 148
  8. 202
  9. 312
  10. 56
  11. 147
  12. 387
  13. 183
  14. 145
  15. 409
  16. 279
  17. 91
  18. 204
  19. 555
  20. 303
  21. 229
  22. 433
  23. 560
  24. 405
  25. 156
  26. 121
  27. 160
  28. 371
  29. 413
  30. 482
  31. 68
  32. 350
  33. 350
  34. 182
  35. 221
  36. 217
  37. 502
  38. 124
  39. 459
  40. 353

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