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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 100 · 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. 1.368 + 57 =
  2. 2.137 + 17 =
  3. 3.151 + 58 =
  4. 4.118 + 47 =
  5. 5.96 + 28 =
  6. 6.121 + 67 =
  7. 7.314 + 17 =
  8. 8.252 + 39 =
  9. 9.472 + 39 =
  10. 10.157 + 29 =
  11. 11.383 + 68 =
  12. 12.66 + 89 =
  13. 13.231 + 57 =
  14. 14.182 + 87 =
  15. 15.145 + 59 =
  16. 16.289 + 67 =
  17. 17.40 + 29 =
  18. 18.138 + 19 =
  19. 19.361 + 37 =
  20. 20.71 + 79 =
  21. 21.413 + 58 =
  22. 22.222 + 29 =
  23. 23.187 + 79 =
  24. 24.170 + 27 =
  25. 25.303 + 99 =
  26. 26.327 + 29 =
  27. 27.49 + 98 =
  28. 28.499 + 28 =
  29. 29.308 + 97 =
  30. 30.119 + 78 =
  31. 31.346 + 97 =
  32. 32.109 + 37 =
  33. 33.275 + 78 =
  34. 34.424 + 47 =
  35. 35.236 + 87 =
  36. 36.62 + 88 =
  37. 37.164 + 98 =
  38. 38.151 + 18 =
  39. 39.101 + 97 =
  40. 40.26 + 97 =

Answer key

  1. 425
  2. 154
  3. 209
  4. 165
  5. 124
  6. 188
  7. 331
  8. 291
  9. 511
  10. 186
  11. 451
  12. 155
  13. 288
  14. 269
  15. 204
  16. 356
  17. 69
  18. 157
  19. 398
  20. 150
  21. 471
  22. 251
  23. 266
  24. 197
  25. 402
  26. 356
  27. 147
  28. 527
  29. 405
  30. 197
  31. 443
  32. 146
  33. 353
  34. 471
  35. 323
  36. 150
  37. 262
  38. 169
  39. 198
  40. 123

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