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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 418 · 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. 1.140 + 47 =
  2. 2.356 + 69 =
  3. 3.304 + 37 =
  4. 4.110 + 48 =
  5. 5.304 + 27 =
  6. 6.66 + 17 =
  7. 7.141 + 27 =
  8. 8.312 + 57 =
  9. 9.42 + 49 =
  10. 10.63 + 28 =
  11. 11.151 + 28 =
  12. 12.388 + 19 =
  13. 13.437 + 28 =
  14. 14.33 + 37 =
  15. 15.146 + 47 =
  16. 16.203 + 28 =
  17. 17.436 + 19 =
  18. 18.327 + 28 =
  19. 19.458 + 18 =
  20. 20.209 + 77 =
  21. 21.266 + 97 =
  22. 22.254 + 69 =
  23. 23.42 + 89 =
  24. 24.40 + 57 =
  25. 25.29 + 97 =
  26. 26.206 + 48 =
  27. 27.175 + 87 =
  28. 28.108 + 37 =
  29. 29.391 + 69 =
  30. 30.207 + 18 =
  31. 31.180 + 39 =
  32. 32.47 + 19 =
  33. 33.57 + 87 =
  34. 34.71 + 77 =
  35. 35.215 + 17 =
  36. 36.39 + 97 =
  37. 37.44 + 37 =
  38. 38.113 + 79 =
  39. 39.467 + 68 =
  40. 40.32 + 37 =

Answer key

  1. 187
  2. 425
  3. 341
  4. 158
  5. 331
  6. 83
  7. 168
  8. 369
  9. 91
  10. 91
  11. 179
  12. 407
  13. 465
  14. 70
  15. 193
  16. 231
  17. 455
  18. 355
  19. 476
  20. 286
  21. 363
  22. 323
  23. 131
  24. 97
  25. 126
  26. 254
  27. 262
  28. 145
  29. 460
  30. 225
  31. 219
  32. 66
  33. 144
  34. 148
  35. 232
  36. 136
  37. 81
  38. 192
  39. 535
  40. 69

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