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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 871 · 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. 1.398 + 18 =
  2. 2.35 + 88 =
  3. 3.194 + 99 =
  4. 4.64 + 77 =
  5. 5.357 + 47 =
  6. 6.436 + 59 =
  7. 7.395 + 19 =
  8. 8.315 + 58 =
  9. 9.47 + 69 =
  10. 10.111 + 39 =
  11. 11.190 + 57 =
  12. 12.335 + 89 =
  13. 13.167 + 97 =
  14. 14.475 + 18 =
  15. 15.412 + 59 =
  16. 16.398 + 68 =
  17. 17.465 + 79 =
  18. 18.419 + 77 =
  19. 19.89 + 29 =
  20. 20.298 + 79 =
  21. 21.389 + 88 =
  22. 22.281 + 19 =
  23. 23.414 + 68 =
  24. 24.440 + 58 =
  25. 25.128 + 19 =
  26. 26.306 + 78 =
  27. 27.305 + 49 =
  28. 28.52 + 67 =
  29. 29.87 + 97 =
  30. 30.258 + 77 =
  31. 31.53 + 17 =
  32. 32.356 + 67 =
  33. 33.116 + 67 =
  34. 34.177 + 99 =
  35. 35.241 + 29 =
  36. 36.219 + 99 =
  37. 37.429 + 18 =
  38. 38.499 + 29 =
  39. 39.436 + 27 =
  40. 40.254 + 27 =

Answer key

  1. 416
  2. 123
  3. 293
  4. 141
  5. 404
  6. 495
  7. 414
  8. 373
  9. 116
  10. 150
  11. 247
  12. 424
  13. 264
  14. 493
  15. 471
  16. 466
  17. 544
  18. 496
  19. 118
  20. 377
  21. 477
  22. 300
  23. 482
  24. 498
  25. 147
  26. 384
  27. 354
  28. 119
  29. 184
  30. 335
  31. 70
  32. 423
  33. 183
  34. 276
  35. 270
  36. 318
  37. 447
  38. 528
  39. 463
  40. 281

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