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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 592 · 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. 1.192 + 69 =
  2. 2.204 + 58 =
  3. 3.317 + 87 =
  4. 4.75 + 38 =
  5. 5.434 + 57 =
  6. 6.30 + 27 =
  7. 7.138 + 88 =
  8. 8.95 + 38 =
  9. 9.65 + 18 =
  10. 10.72 + 28 =
  11. 11.71 + 19 =
  12. 12.244 + 57 =
  13. 13.162 + 27 =
  14. 14.210 + 19 =
  15. 15.258 + 47 =
  16. 16.372 + 67 =
  17. 17.114 + 29 =
  18. 18.175 + 78 =
  19. 19.249 + 38 =
  20. 20.494 + 69 =
  21. 21.26 + 48 =
  22. 22.105 + 19 =
  23. 23.111 + 99 =
  24. 24.51 + 38 =
  25. 25.307 + 38 =
  26. 26.97 + 49 =
  27. 27.441 + 58 =
  28. 28.88 + 59 =
  29. 29.398 + 37 =
  30. 30.105 + 79 =
  31. 31.347 + 19 =
  32. 32.63 + 18 =
  33. 33.80 + 99 =
  34. 34.221 + 18 =
  35. 35.229 + 18 =
  36. 36.272 + 67 =
  37. 37.51 + 69 =
  38. 38.102 + 68 =
  39. 39.463 + 29 =
  40. 40.270 + 68 =

Answer key

  1. 261
  2. 262
  3. 404
  4. 113
  5. 491
  6. 57
  7. 226
  8. 133
  9. 83
  10. 100
  11. 90
  12. 301
  13. 189
  14. 229
  15. 305
  16. 439
  17. 143
  18. 253
  19. 287
  20. 563
  21. 74
  22. 124
  23. 210
  24. 89
  25. 345
  26. 146
  27. 499
  28. 147
  29. 435
  30. 184
  31. 366
  32. 81
  33. 179
  34. 239
  35. 247
  36. 339
  37. 120
  38. 170
  39. 492
  40. 338

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