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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 525 · 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. 1.121 + 78 =
  2. 2.171 + 99 =
  3. 3.195 + 39 =
  4. 4.161 + 27 =
  5. 5.144 + 27 =
  6. 6.232 + 58 =
  7. 7.169 + 47 =
  8. 8.46 + 58 =
  9. 9.66 + 27 =
  10. 10.77 + 27 =
  11. 11.377 + 49 =
  12. 12.103 + 47 =
  13. 13.124 + 87 =
  14. 14.464 + 97 =
  15. 15.223 + 98 =
  16. 16.332 + 38 =
  17. 17.271 + 89 =
  18. 18.389 + 57 =
  19. 19.268 + 29 =
  20. 20.292 + 79 =
  21. 21.377 + 19 =
  22. 22.357 + 39 =
  23. 23.46 + 59 =
  24. 24.464 + 97 =
  25. 25.299 + 97 =
  26. 26.410 + 28 =
  27. 27.444 + 67 =
  28. 28.254 + 18 =
  29. 29.449 + 19 =
  30. 30.70 + 57 =
  31. 31.176 + 79 =
  32. 32.155 + 97 =
  33. 33.359 + 69 =
  34. 34.275 + 39 =
  35. 35.157 + 99 =
  36. 36.173 + 59 =
  37. 37.27 + 68 =
  38. 38.132 + 27 =
  39. 39.450 + 99 =
  40. 40.103 + 27 =

Answer key

  1. 199
  2. 270
  3. 234
  4. 188
  5. 171
  6. 290
  7. 216
  8. 104
  9. 93
  10. 104
  11. 426
  12. 150
  13. 211
  14. 561
  15. 321
  16. 370
  17. 360
  18. 446
  19. 297
  20. 371
  21. 396
  22. 396
  23. 105
  24. 561
  25. 396
  26. 438
  27. 511
  28. 272
  29. 468
  30. 127
  31. 255
  32. 252
  33. 428
  34. 314
  35. 256
  36. 232
  37. 95
  38. 159
  39. 549
  40. 130

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