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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 268 · 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. 1.81 + 67 =
  2. 2.458 + 29 =
  3. 3.225 + 99 =
  4. 4.243 + 28 =
  5. 5.164 + 48 =
  6. 6.41 + 69 =
  7. 7.50 + 88 =
  8. 8.363 + 27 =
  9. 9.468 + 98 =
  10. 10.420 + 49 =
  11. 11.38 + 38 =
  12. 12.228 + 28 =
  13. 13.270 + 17 =
  14. 14.173 + 67 =
  15. 15.297 + 78 =
  16. 16.180 + 38 =
  17. 17.42 + 79 =
  18. 18.440 + 39 =
  19. 19.312 + 18 =
  20. 20.99 + 99 =
  21. 21.293 + 37 =
  22. 22.37 + 17 =
  23. 23.375 + 19 =
  24. 24.380 + 17 =
  25. 25.131 + 77 =
  26. 26.431 + 58 =
  27. 27.277 + 58 =
  28. 28.73 + 78 =
  29. 29.429 + 79 =
  30. 30.498 + 87 =
  31. 31.31 + 38 =
  32. 32.220 + 59 =
  33. 33.168 + 17 =
  34. 34.100 + 88 =
  35. 35.338 + 39 =
  36. 36.80 + 67 =
  37. 37.183 + 47 =
  38. 38.349 + 39 =
  39. 39.368 + 58 =
  40. 40.32 + 18 =

Answer key

  1. 148
  2. 487
  3. 324
  4. 271
  5. 212
  6. 110
  7. 138
  8. 390
  9. 566
  10. 469
  11. 76
  12. 256
  13. 287
  14. 240
  15. 375
  16. 218
  17. 121
  18. 479
  19. 330
  20. 198
  21. 330
  22. 54
  23. 394
  24. 397
  25. 208
  26. 489
  27. 335
  28. 151
  29. 508
  30. 585
  31. 69
  32. 279
  33. 185
  34. 188
  35. 377
  36. 147
  37. 230
  38. 388
  39. 426
  40. 50

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