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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 575 · 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. 1.247 + 58 =
  2. 2.164 + 39 =
  3. 3.118 + 68 =
  4. 4.240 + 87 =
  5. 5.483 + 19 =
  6. 6.314 + 47 =
  7. 7.261 + 67 =
  8. 8.197 + 48 =
  9. 9.398 + 48 =
  10. 10.28 + 18 =
  11. 11.67 + 49 =
  12. 12.154 + 77 =
  13. 13.82 + 29 =
  14. 14.279 + 58 =
  15. 15.246 + 38 =
  16. 16.121 + 47 =
  17. 17.425 + 78 =
  18. 18.481 + 28 =
  19. 19.123 + 57 =
  20. 20.75 + 69 =
  21. 21.383 + 78 =
  22. 22.62 + 19 =
  23. 23.486 + 38 =
  24. 24.41 + 59 =
  25. 25.96 + 99 =
  26. 26.231 + 98 =
  27. 27.247 + 98 =
  28. 28.108 + 38 =
  29. 29.83 + 77 =
  30. 30.330 + 58 =
  31. 31.451 + 58 =
  32. 32.379 + 69 =
  33. 33.90 + 28 =
  34. 34.110 + 99 =
  35. 35.66 + 98 =
  36. 36.412 + 48 =
  37. 37.442 + 79 =
  38. 38.111 + 18 =
  39. 39.215 + 89 =
  40. 40.38 + 59 =

Answer key

  1. 305
  2. 203
  3. 186
  4. 327
  5. 502
  6. 361
  7. 328
  8. 245
  9. 446
  10. 46
  11. 116
  12. 231
  13. 111
  14. 337
  15. 284
  16. 168
  17. 503
  18. 509
  19. 180
  20. 144
  21. 461
  22. 81
  23. 524
  24. 100
  25. 195
  26. 329
  27. 345
  28. 146
  29. 160
  30. 388
  31. 509
  32. 448
  33. 118
  34. 209
  35. 164
  36. 460
  37. 521
  38. 129
  39. 304
  40. 97

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