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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 120 · 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. 1.309 + 28 =
  2. 2.183 + 77 =
  3. 3.383 + 79 =
  4. 4.87 + 88 =
  5. 5.494 + 78 =
  6. 6.89 + 37 =
  7. 7.127 + 39 =
  8. 8.159 + 68 =
  9. 9.267 + 27 =
  10. 10.474 + 19 =
  11. 11.176 + 99 =
  12. 12.398 + 99 =
  13. 13.422 + 18 =
  14. 14.59 + 58 =
  15. 15.230 + 39 =
  16. 16.439 + 28 =
  17. 17.326 + 88 =
  18. 18.27 + 47 =
  19. 19.456 + 28 =
  20. 20.315 + 29 =
  21. 21.78 + 38 =
  22. 22.495 + 29 =
  23. 23.348 + 59 =
  24. 24.132 + 67 =
  25. 25.82 + 57 =
  26. 26.386 + 19 =
  27. 27.398 + 19 =
  28. 28.285 + 18 =
  29. 29.301 + 28 =
  30. 30.98 + 27 =
  31. 31.333 + 77 =
  32. 32.271 + 58 =
  33. 33.181 + 88 =
  34. 34.312 + 57 =
  35. 35.62 + 47 =
  36. 36.331 + 88 =
  37. 37.229 + 38 =
  38. 38.474 + 47 =
  39. 39.474 + 59 =
  40. 40.141 + 18 =

Answer key

  1. 337
  2. 260
  3. 462
  4. 175
  5. 572
  6. 126
  7. 166
  8. 227
  9. 294
  10. 493
  11. 275
  12. 497
  13. 440
  14. 117
  15. 269
  16. 467
  17. 414
  18. 74
  19. 484
  20. 344
  21. 116
  22. 524
  23. 407
  24. 199
  25. 139
  26. 405
  27. 417
  28. 303
  29. 329
  30. 125
  31. 410
  32. 329
  33. 269
  34. 369
  35. 109
  36. 419
  37. 267
  38. 521
  39. 533
  40. 159

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