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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 466 · 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. 1.257 + 58 =
  2. 2.351 + 78 =
  3. 3.228 + 28 =
  4. 4.255 + 38 =
  5. 5.51 + 37 =
  6. 6.135 + 97 =
  7. 7.442 + 69 =
  8. 8.334 + 57 =
  9. 9.158 + 37 =
  10. 10.133 + 79 =
  11. 11.83 + 87 =
  12. 12.315 + 99 =
  13. 13.118 + 99 =
  14. 14.221 + 18 =
  15. 15.351 + 49 =
  16. 16.46 + 29 =
  17. 17.496 + 17 =
  18. 18.335 + 28 =
  19. 19.146 + 59 =
  20. 20.418 + 39 =
  21. 21.123 + 17 =
  22. 22.457 + 68 =
  23. 23.359 + 98 =
  24. 24.194 + 99 =
  25. 25.208 + 18 =
  26. 26.279 + 58 =
  27. 27.116 + 19 =
  28. 28.396 + 28 =
  29. 29.351 + 68 =
  30. 30.429 + 39 =
  31. 31.231 + 69 =
  32. 32.355 + 18 =
  33. 33.254 + 67 =
  34. 34.234 + 78 =
  35. 35.53 + 77 =
  36. 36.250 + 98 =
  37. 37.137 + 79 =
  38. 38.350 + 68 =
  39. 39.487 + 17 =
  40. 40.207 + 99 =

Answer key

  1. 315
  2. 429
  3. 256
  4. 293
  5. 88
  6. 232
  7. 511
  8. 391
  9. 195
  10. 212
  11. 170
  12. 414
  13. 217
  14. 239
  15. 400
  16. 75
  17. 513
  18. 363
  19. 205
  20. 457
  21. 140
  22. 525
  23. 457
  24. 293
  25. 226
  26. 337
  27. 135
  28. 424
  29. 419
  30. 468
  31. 300
  32. 373
  33. 321
  34. 312
  35. 130
  36. 348
  37. 216
  38. 418
  39. 504
  40. 306

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