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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 614 · 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. 1.127 + 18 =
  2. 2.438 + 79 =
  3. 3.425 + 87 =
  4. 4.417 + 78 =
  5. 5.337 + 17 =
  6. 6.288 + 47 =
  7. 7.114 + 97 =
  8. 8.384 + 98 =
  9. 9.62 + 28 =
  10. 10.267 + 29 =
  11. 11.292 + 29 =
  12. 12.313 + 79 =
  13. 13.51 + 18 =
  14. 14.273 + 78 =
  15. 15.114 + 18 =
  16. 16.161 + 49 =
  17. 17.196 + 49 =
  18. 18.289 + 29 =
  19. 19.430 + 89 =
  20. 20.405 + 49 =
  21. 21.372 + 29 =
  22. 22.232 + 49 =
  23. 23.111 + 98 =
  24. 24.220 + 17 =
  25. 25.145 + 38 =
  26. 26.492 + 59 =
  27. 27.51 + 97 =
  28. 28.349 + 87 =
  29. 29.196 + 98 =
  30. 30.282 + 28 =
  31. 31.487 + 89 =
  32. 32.237 + 28 =
  33. 33.317 + 97 =
  34. 34.137 + 37 =
  35. 35.121 + 87 =
  36. 36.53 + 29 =
  37. 37.78 + 59 =
  38. 38.251 + 68 =
  39. 39.363 + 67 =
  40. 40.425 + 37 =

Answer key

  1. 145
  2. 517
  3. 512
  4. 495
  5. 354
  6. 335
  7. 211
  8. 482
  9. 90
  10. 296
  11. 321
  12. 392
  13. 69
  14. 351
  15. 132
  16. 210
  17. 245
  18. 318
  19. 519
  20. 454
  21. 401
  22. 281
  23. 209
  24. 237
  25. 183
  26. 551
  27. 148
  28. 436
  29. 294
  30. 310
  31. 576
  32. 265
  33. 414
  34. 174
  35. 208
  36. 82
  37. 137
  38. 319
  39. 430
  40. 462

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