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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 140 · 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. 1.201 + 79 =
  2. 2.195 + 27 =
  3. 3.145 + 68 =
  4. 4.368 + 87 =
  5. 5.281 + 98 =
  6. 6.435 + 79 =
  7. 7.66 + 48 =
  8. 8.353 + 17 =
  9. 9.429 + 18 =
  10. 10.30 + 69 =
  11. 11.359 + 78 =
  12. 12.122 + 88 =
  13. 13.120 + 38 =
  14. 14.103 + 29 =
  15. 15.435 + 99 =
  16. 16.30 + 77 =
  17. 17.251 + 97 =
  18. 18.497 + 19 =
  19. 19.71 + 29 =
  20. 20.400 + 18 =
  21. 21.27 + 47 =
  22. 22.291 + 88 =
  23. 23.96 + 28 =
  24. 24.483 + 27 =
  25. 25.407 + 69 =
  26. 26.122 + 87 =
  27. 27.131 + 37 =
  28. 28.82 + 58 =
  29. 29.354 + 17 =
  30. 30.35 + 29 =
  31. 31.442 + 27 =
  32. 32.49 + 17 =
  33. 33.292 + 48 =
  34. 34.69 + 77 =
  35. 35.356 + 49 =
  36. 36.97 + 69 =
  37. 37.42 + 37 =
  38. 38.243 + 19 =
  39. 39.92 + 49 =
  40. 40.158 + 37 =

Answer key

  1. 280
  2. 222
  3. 213
  4. 455
  5. 379
  6. 514
  7. 114
  8. 370
  9. 447
  10. 99
  11. 437
  12. 210
  13. 158
  14. 132
  15. 534
  16. 107
  17. 348
  18. 516
  19. 100
  20. 418
  21. 74
  22. 379
  23. 124
  24. 510
  25. 476
  26. 209
  27. 168
  28. 140
  29. 371
  30. 64
  31. 469
  32. 66
  33. 340
  34. 146
  35. 405
  36. 166
  37. 79
  38. 262
  39. 141
  40. 195

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