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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 397 · 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. 1.379 + 48 =
  2. 2.396 + 18 =
  3. 3.339 + 28 =
  4. 4.46 + 17 =
  5. 5.219 + 88 =
  6. 6.96 + 17 =
  7. 7.423 + 89 =
  8. 8.271 + 59 =
  9. 9.261 + 19 =
  10. 10.427 + 28 =
  11. 11.364 + 69 =
  12. 12.31 + 38 =
  13. 13.316 + 38 =
  14. 14.56 + 68 =
  15. 15.47 + 17 =
  16. 16.371 + 88 =
  17. 17.293 + 88 =
  18. 18.470 + 58 =
  19. 19.326 + 48 =
  20. 20.55 + 97 =
  21. 21.271 + 19 =
  22. 22.203 + 49 =
  23. 23.260 + 98 =
  24. 24.36 + 57 =
  25. 25.61 + 68 =
  26. 26.37 + 17 =
  27. 27.71 + 79 =
  28. 28.167 + 88 =
  29. 29.256 + 59 =
  30. 30.360 + 79 =
  31. 31.136 + 99 =
  32. 32.108 + 58 =
  33. 33.122 + 77 =
  34. 34.456 + 17 =
  35. 35.292 + 59 =
  36. 36.104 + 97 =
  37. 37.462 + 59 =
  38. 38.372 + 67 =
  39. 39.51 + 58 =
  40. 40.253 + 97 =

Answer key

  1. 427
  2. 414
  3. 367
  4. 63
  5. 307
  6. 113
  7. 512
  8. 330
  9. 280
  10. 455
  11. 433
  12. 69
  13. 354
  14. 124
  15. 64
  16. 459
  17. 381
  18. 528
  19. 374
  20. 152
  21. 290
  22. 252
  23. 358
  24. 93
  25. 129
  26. 54
  27. 150
  28. 255
  29. 315
  30. 439
  31. 235
  32. 166
  33. 199
  34. 473
  35. 351
  36. 201
  37. 521
  38. 439
  39. 109
  40. 350

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