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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 221 · 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. 1.69 + 67 =
  2. 2.275 + 98 =
  3. 3.347 + 58 =
  4. 4.135 + 48 =
  5. 5.171 + 99 =
  6. 6.353 + 28 =
  7. 7.35 + 58 =
  8. 8.416 + 27 =
  9. 9.280 + 59 =
  10. 10.124 + 18 =
  11. 11.51 + 69 =
  12. 12.151 + 67 =
  13. 13.292 + 69 =
  14. 14.41 + 17 =
  15. 15.463 + 58 =
  16. 16.286 + 78 =
  17. 17.397 + 68 =
  18. 18.443 + 37 =
  19. 19.232 + 87 =
  20. 20.208 + 69 =
  21. 21.294 + 48 =
  22. 22.446 + 39 =
  23. 23.126 + 68 =
  24. 24.94 + 38 =
  25. 25.69 + 29 =
  26. 26.441 + 39 =
  27. 27.198 + 57 =
  28. 28.375 + 89 =
  29. 29.281 + 99 =
  30. 30.124 + 89 =
  31. 31.93 + 28 =
  32. 32.103 + 39 =
  33. 33.105 + 87 =
  34. 34.348 + 77 =
  35. 35.91 + 69 =
  36. 36.314 + 48 =
  37. 37.44 + 69 =
  38. 38.469 + 27 =
  39. 39.308 + 39 =
  40. 40.30 + 19 =

Answer key

  1. 136
  2. 373
  3. 405
  4. 183
  5. 270
  6. 381
  7. 93
  8. 443
  9. 339
  10. 142
  11. 120
  12. 218
  13. 361
  14. 58
  15. 521
  16. 364
  17. 465
  18. 480
  19. 319
  20. 277
  21. 342
  22. 485
  23. 194
  24. 132
  25. 98
  26. 480
  27. 255
  28. 464
  29. 380
  30. 213
  31. 121
  32. 142
  33. 192
  34. 425
  35. 160
  36. 362
  37. 113
  38. 496
  39. 347
  40. 49

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