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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 374 · 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. 1.389 + 38 =
  2. 2.479 + 57 =
  3. 3.340 + 17 =
  4. 4.47 + 99 =
  5. 5.303 + 97 =
  6. 6.128 + 99 =
  7. 7.112 + 59 =
  8. 8.214 + 48 =
  9. 9.153 + 28 =
  10. 10.389 + 99 =
  11. 11.273 + 47 =
  12. 12.183 + 48 =
  13. 13.391 + 37 =
  14. 14.235 + 69 =
  15. 15.223 + 89 =
  16. 16.78 + 99 =
  17. 17.332 + 78 =
  18. 18.85 + 37 =
  19. 19.137 + 19 =
  20. 20.238 + 77 =
  21. 21.42 + 69 =
  22. 22.235 + 49 =
  23. 23.229 + 89 =
  24. 24.45 + 69 =
  25. 25.219 + 59 =
  26. 26.318 + 88 =
  27. 27.299 + 89 =
  28. 28.390 + 49 =
  29. 29.232 + 47 =
  30. 30.231 + 48 =
  31. 31.54 + 87 =
  32. 32.237 + 38 =
  33. 33.162 + 89 =
  34. 34.400 + 57 =
  35. 35.225 + 38 =
  36. 36.317 + 38 =
  37. 37.126 + 98 =
  38. 38.273 + 47 =
  39. 39.496 + 27 =
  40. 40.56 + 97 =

Answer key

  1. 427
  2. 536
  3. 357
  4. 146
  5. 400
  6. 227
  7. 171
  8. 262
  9. 181
  10. 488
  11. 320
  12. 231
  13. 428
  14. 304
  15. 312
  16. 177
  17. 410
  18. 122
  19. 156
  20. 315
  21. 111
  22. 284
  23. 318
  24. 114
  25. 278
  26. 406
  27. 388
  28. 439
  29. 279
  30. 279
  31. 141
  32. 275
  33. 251
  34. 457
  35. 263
  36. 355
  37. 224
  38. 320
  39. 523
  40. 153

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