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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 767 · 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. 1.282 + 48 =
  2. 2.258 + 37 =
  3. 3.462 + 28 =
  4. 4.432 + 88 =
  5. 5.180 + 18 =
  6. 6.194 + 68 =
  7. 7.492 + 17 =
  8. 8.109 + 37 =
  9. 9.302 + 97 =
  10. 10.77 + 19 =
  11. 11.187 + 79 =
  12. 12.60 + 89 =
  13. 13.200 + 37 =
  14. 14.91 + 97 =
  15. 15.263 + 67 =
  16. 16.376 + 17 =
  17. 17.197 + 48 =
  18. 18.248 + 39 =
  19. 19.164 + 79 =
  20. 20.434 + 19 =
  21. 21.33 + 98 =
  22. 22.29 + 59 =
  23. 23.69 + 77 =
  24. 24.129 + 47 =
  25. 25.128 + 27 =
  26. 26.288 + 18 =
  27. 27.303 + 87 =
  28. 28.116 + 79 =
  29. 29.309 + 28 =
  30. 30.457 + 27 =
  31. 31.451 + 97 =
  32. 32.37 + 37 =
  33. 33.407 + 59 =
  34. 34.224 + 29 =
  35. 35.43 + 48 =
  36. 36.332 + 37 =
  37. 37.340 + 79 =
  38. 38.411 + 37 =
  39. 39.306 + 39 =
  40. 40.330 + 98 =

Answer key

  1. 330
  2. 295
  3. 490
  4. 520
  5. 198
  6. 262
  7. 509
  8. 146
  9. 399
  10. 96
  11. 266
  12. 149
  13. 237
  14. 188
  15. 330
  16. 393
  17. 245
  18. 287
  19. 243
  20. 453
  21. 131
  22. 88
  23. 146
  24. 176
  25. 155
  26. 306
  27. 390
  28. 195
  29. 337
  30. 484
  31. 548
  32. 74
  33. 466
  34. 253
  35. 91
  36. 369
  37. 419
  38. 448
  39. 345
  40. 428

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