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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 474 · 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. 1.213 + 98 =
  2. 2.392 + 69 =
  3. 3.134 + 27 =
  4. 4.42 + 78 =
  5. 5.67 + 79 =
  6. 6.438 + 17 =
  7. 7.148 + 67 =
  8. 8.450 + 88 =
  9. 9.196 + 27 =
  10. 10.133 + 98 =
  11. 11.427 + 27 =
  12. 12.494 + 58 =
  13. 13.43 + 49 =
  14. 14.269 + 79 =
  15. 15.473 + 68 =
  16. 16.324 + 17 =
  17. 17.128 + 78 =
  18. 18.192 + 97 =
  19. 19.233 + 37 =
  20. 20.53 + 99 =
  21. 21.81 + 28 =
  22. 22.295 + 87 =
  23. 23.301 + 49 =
  24. 24.129 + 29 =
  25. 25.174 + 19 =
  26. 26.322 + 27 =
  27. 27.39 + 49 =
  28. 28.163 + 39 =
  29. 29.45 + 27 =
  30. 30.340 + 69 =
  31. 31.158 + 38 =
  32. 32.53 + 78 =
  33. 33.144 + 27 =
  34. 34.452 + 67 =
  35. 35.174 + 19 =
  36. 36.252 + 59 =
  37. 37.338 + 67 =
  38. 38.63 + 89 =
  39. 39.354 + 17 =
  40. 40.33 + 89 =

Answer key

  1. 311
  2. 461
  3. 161
  4. 120
  5. 146
  6. 455
  7. 215
  8. 538
  9. 223
  10. 231
  11. 454
  12. 552
  13. 92
  14. 348
  15. 541
  16. 341
  17. 206
  18. 289
  19. 270
  20. 152
  21. 109
  22. 382
  23. 350
  24. 158
  25. 193
  26. 349
  27. 88
  28. 202
  29. 72
  30. 409
  31. 196
  32. 131
  33. 171
  34. 519
  35. 193
  36. 311
  37. 405
  38. 152
  39. 371
  40. 122

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