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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 260 · 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. 1.192 + 17 =
  2. 2.249 + 88 =
  3. 3.408 + 77 =
  4. 4.87 + 79 =
  5. 5.231 + 77 =
  6. 6.71 + 47 =
  7. 7.137 + 67 =
  8. 8.224 + 37 =
  9. 9.417 + 77 =
  10. 10.74 + 68 =
  11. 11.81 + 89 =
  12. 12.385 + 68 =
  13. 13.80 + 69 =
  14. 14.394 + 19 =
  15. 15.291 + 67 =
  16. 16.93 + 68 =
  17. 17.224 + 29 =
  18. 18.133 + 77 =
  19. 19.245 + 48 =
  20. 20.335 + 97 =
  21. 21.52 + 27 =
  22. 22.168 + 78 =
  23. 23.465 + 39 =
  24. 24.226 + 38 =
  25. 25.299 + 97 =
  26. 26.164 + 69 =
  27. 27.38 + 37 =
  28. 28.252 + 17 =
  29. 29.410 + 57 =
  30. 30.178 + 68 =
  31. 31.421 + 87 =
  32. 32.204 + 97 =
  33. 33.269 + 69 =
  34. 34.478 + 48 =
  35. 35.394 + 58 =
  36. 36.122 + 19 =
  37. 37.223 + 18 =
  38. 38.129 + 29 =
  39. 39.375 + 87 =
  40. 40.425 + 49 =

Answer key

  1. 209
  2. 337
  3. 485
  4. 166
  5. 308
  6. 118
  7. 204
  8. 261
  9. 494
  10. 142
  11. 170
  12. 453
  13. 149
  14. 413
  15. 358
  16. 161
  17. 253
  18. 210
  19. 293
  20. 432
  21. 79
  22. 246
  23. 504
  24. 264
  25. 396
  26. 233
  27. 75
  28. 269
  29. 467
  30. 246
  31. 508
  32. 301
  33. 338
  34. 526
  35. 452
  36. 141
  37. 241
  38. 158
  39. 462
  40. 474

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