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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 547 · 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. 1.366 + 87 =
  2. 2.259 + 47 =
  3. 3.95 + 17 =
  4. 4.363 + 69 =
  5. 5.220 + 57 =
  6. 6.491 + 38 =
  7. 7.353 + 49 =
  8. 8.174 + 79 =
  9. 9.327 + 67 =
  10. 10.169 + 59 =
  11. 11.175 + 77 =
  12. 12.408 + 17 =
  13. 13.177 + 57 =
  14. 14.320 + 49 =
  15. 15.125 + 48 =
  16. 16.103 + 89 =
  17. 17.124 + 47 =
  18. 18.351 + 89 =
  19. 19.196 + 29 =
  20. 20.247 + 68 =
  21. 21.332 + 77 =
  22. 22.404 + 27 =
  23. 23.74 + 38 =
  24. 24.416 + 47 =
  25. 25.173 + 18 =
  26. 26.168 + 37 =
  27. 27.28 + 89 =
  28. 28.151 + 27 =
  29. 29.344 + 57 =
  30. 30.177 + 59 =
  31. 31.385 + 99 =
  32. 32.94 + 89 =
  33. 33.499 + 97 =
  34. 34.348 + 88 =
  35. 35.400 + 28 =
  36. 36.34 + 97 =
  37. 37.355 + 18 =
  38. 38.196 + 48 =
  39. 39.346 + 27 =
  40. 40.245 + 59 =

Answer key

  1. 453
  2. 306
  3. 112
  4. 432
  5. 277
  6. 529
  7. 402
  8. 253
  9. 394
  10. 228
  11. 252
  12. 425
  13. 234
  14. 369
  15. 173
  16. 192
  17. 171
  18. 440
  19. 225
  20. 315
  21. 409
  22. 431
  23. 112
  24. 463
  25. 191
  26. 205
  27. 117
  28. 178
  29. 401
  30. 236
  31. 484
  32. 183
  33. 596
  34. 436
  35. 428
  36. 131
  37. 373
  38. 244
  39. 373
  40. 304

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