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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 581 · 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. 1.334 + 69 =
  2. 2.30 + 19 =
  3. 3.61 + 39 =
  4. 4.158 + 88 =
  5. 5.97 + 29 =
  6. 6.415 + 77 =
  7. 7.81 + 88 =
  8. 8.114 + 59 =
  9. 9.47 + 29 =
  10. 10.359 + 58 =
  11. 11.361 + 28 =
  12. 12.469 + 27 =
  13. 13.49 + 17 =
  14. 14.477 + 18 =
  15. 15.123 + 97 =
  16. 16.165 + 37 =
  17. 17.46 + 38 =
  18. 18.306 + 28 =
  19. 19.300 + 77 =
  20. 20.457 + 88 =
  21. 21.62 + 58 =
  22. 22.413 + 68 =
  23. 23.153 + 69 =
  24. 24.435 + 59 =
  25. 25.295 + 57 =
  26. 26.349 + 78 =
  27. 27.142 + 19 =
  28. 28.271 + 88 =
  29. 29.323 + 17 =
  30. 30.50 + 67 =
  31. 31.471 + 97 =
  32. 32.425 + 47 =
  33. 33.25 + 97 =
  34. 34.415 + 18 =
  35. 35.208 + 79 =
  36. 36.282 + 29 =
  37. 37.456 + 49 =
  38. 38.127 + 47 =
  39. 39.462 + 17 =
  40. 40.452 + 67 =

Answer key

  1. 403
  2. 49
  3. 100
  4. 246
  5. 126
  6. 492
  7. 169
  8. 173
  9. 76
  10. 417
  11. 389
  12. 496
  13. 66
  14. 495
  15. 220
  16. 202
  17. 84
  18. 334
  19. 377
  20. 545
  21. 120
  22. 481
  23. 222
  24. 494
  25. 352
  26. 427
  27. 161
  28. 359
  29. 340
  30. 117
  31. 568
  32. 472
  33. 122
  34. 433
  35. 287
  36. 311
  37. 505
  38. 174
  39. 479
  40. 519

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