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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 41 · 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. 1.114 + 18 =
  2. 2.74 + 78 =
  3. 3.26 + 38 =
  4. 4.239 + 47 =
  5. 5.310 + 48 =
  6. 6.342 + 98 =
  7. 7.230 + 39 =
  8. 8.345 + 97 =
  9. 9.99 + 38 =
  10. 10.481 + 19 =
  11. 11.45 + 19 =
  12. 12.135 + 77 =
  13. 13.453 + 27 =
  14. 14.68 + 97 =
  15. 15.306 + 79 =
  16. 16.64 + 58 =
  17. 17.138 + 19 =
  18. 18.338 + 18 =
  19. 19.108 + 59 =
  20. 20.239 + 19 =
  21. 21.369 + 29 =
  22. 22.296 + 29 =
  23. 23.260 + 79 =
  24. 24.152 + 88 =
  25. 25.272 + 18 =
  26. 26.47 + 19 =
  27. 27.453 + 88 =
  28. 28.482 + 18 =
  29. 29.258 + 37 =
  30. 30.78 + 59 =
  31. 31.88 + 39 =
  32. 32.99 + 38 =
  33. 33.164 + 37 =
  34. 34.173 + 89 =
  35. 35.230 + 49 =
  36. 36.380 + 19 =
  37. 37.157 + 17 =
  38. 38.327 + 78 =
  39. 39.498 + 28 =
  40. 40.146 + 28 =

Answer key

  1. 132
  2. 152
  3. 64
  4. 286
  5. 358
  6. 440
  7. 269
  8. 442
  9. 137
  10. 500
  11. 64
  12. 212
  13. 480
  14. 165
  15. 385
  16. 122
  17. 157
  18. 356
  19. 167
  20. 258
  21. 398
  22. 325
  23. 339
  24. 240
  25. 290
  26. 66
  27. 541
  28. 500
  29. 295
  30. 137
  31. 127
  32. 137
  33. 201
  34. 262
  35. 279
  36. 399
  37. 174
  38. 405
  39. 526
  40. 174

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