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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 736 · 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. 1.430 + 38 =
  2. 2.328 + 99 =
  3. 3.251 + 67 =
  4. 4.84 + 49 =
  5. 5.215 + 57 =
  6. 6.37 + 67 =
  7. 7.46 + 17 =
  8. 8.336 + 67 =
  9. 9.463 + 68 =
  10. 10.377 + 87 =
  11. 11.133 + 77 =
  12. 12.362 + 88 =
  13. 13.315 + 19 =
  14. 14.117 + 97 =
  15. 15.294 + 29 =
  16. 16.433 + 59 =
  17. 17.204 + 88 =
  18. 18.25 + 38 =
  19. 19.401 + 58 =
  20. 20.160 + 27 =
  21. 21.43 + 67 =
  22. 22.72 + 28 =
  23. 23.92 + 87 =
  24. 24.425 + 69 =
  25. 25.468 + 57 =
  26. 26.457 + 49 =
  27. 27.115 + 89 =
  28. 28.348 + 88 =
  29. 29.425 + 57 =
  30. 30.436 + 28 =
  31. 31.27 + 97 =
  32. 32.87 + 27 =
  33. 33.354 + 77 =
  34. 34.99 + 59 =
  35. 35.435 + 48 =
  36. 36.291 + 38 =
  37. 37.187 + 87 =
  38. 38.404 + 77 =
  39. 39.171 + 29 =
  40. 40.420 + 99 =

Answer key

  1. 468
  2. 427
  3. 318
  4. 133
  5. 272
  6. 104
  7. 63
  8. 403
  9. 531
  10. 464
  11. 210
  12. 450
  13. 334
  14. 214
  15. 323
  16. 492
  17. 292
  18. 63
  19. 459
  20. 187
  21. 110
  22. 100
  23. 179
  24. 494
  25. 525
  26. 506
  27. 204
  28. 436
  29. 482
  30. 464
  31. 124
  32. 114
  33. 431
  34. 158
  35. 483
  36. 329
  37. 274
  38. 481
  39. 200
  40. 519

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