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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 793 · 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. 1.288 + 68 =
  2. 2.195 + 48 =
  3. 3.409 + 28 =
  4. 4.433 + 47 =
  5. 5.71 + 38 =
  6. 6.97 + 97 =
  7. 7.267 + 29 =
  8. 8.168 + 19 =
  9. 9.76 + 97 =
  10. 10.235 + 27 =
  11. 11.164 + 38 =
  12. 12.449 + 77 =
  13. 13.179 + 77 =
  14. 14.28 + 87 =
  15. 15.418 + 87 =
  16. 16.338 + 89 =
  17. 17.430 + 77 =
  18. 18.307 + 28 =
  19. 19.255 + 59 =
  20. 20.226 + 47 =
  21. 21.324 + 89 =
  22. 22.271 + 19 =
  23. 23.28 + 99 =
  24. 24.375 + 58 =
  25. 25.485 + 39 =
  26. 26.456 + 98 =
  27. 27.415 + 17 =
  28. 28.32 + 28 =
  29. 29.218 + 18 =
  30. 30.46 + 79 =
  31. 31.477 + 87 =
  32. 32.184 + 49 =
  33. 33.485 + 17 =
  34. 34.351 + 27 =
  35. 35.493 + 29 =
  36. 36.43 + 38 =
  37. 37.41 + 97 =
  38. 38.184 + 79 =
  39. 39.314 + 68 =
  40. 40.458 + 19 =

Answer key

  1. 356
  2. 243
  3. 437
  4. 480
  5. 109
  6. 194
  7. 296
  8. 187
  9. 173
  10. 262
  11. 202
  12. 526
  13. 256
  14. 115
  15. 505
  16. 427
  17. 507
  18. 335
  19. 314
  20. 273
  21. 413
  22. 290
  23. 127
  24. 433
  25. 524
  26. 554
  27. 432
  28. 60
  29. 236
  30. 125
  31. 564
  32. 233
  33. 502
  34. 378
  35. 522
  36. 81
  37. 138
  38. 263
  39. 382
  40. 477

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