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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 930 · 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. 1.196 + 17 =
  2. 2.141 + 17 =
  3. 3.165 + 19 =
  4. 4.344 + 99 =
  5. 5.234 + 67 =
  6. 6.486 + 18 =
  7. 7.169 + 17 =
  8. 8.457 + 77 =
  9. 9.276 + 17 =
  10. 10.386 + 19 =
  11. 11.489 + 87 =
  12. 12.65 + 47 =
  13. 13.221 + 29 =
  14. 14.170 + 18 =
  15. 15.201 + 89 =
  16. 16.209 + 47 =
  17. 17.471 + 47 =
  18. 18.62 + 39 =
  19. 19.422 + 89 =
  20. 20.138 + 68 =
  21. 21.400 + 28 =
  22. 22.211 + 57 =
  23. 23.39 + 29 =
  24. 24.338 + 89 =
  25. 25.416 + 59 =
  26. 26.414 + 18 =
  27. 27.39 + 19 =
  28. 28.77 + 18 =
  29. 29.445 + 17 =
  30. 30.482 + 87 =
  31. 31.454 + 28 =
  32. 32.341 + 87 =
  33. 33.302 + 99 =
  34. 34.278 + 29 =
  35. 35.43 + 47 =
  36. 36.83 + 18 =
  37. 37.48 + 87 =
  38. 38.97 + 87 =
  39. 39.427 + 28 =
  40. 40.469 + 29 =

Answer key

  1. 213
  2. 158
  3. 184
  4. 443
  5. 301
  6. 504
  7. 186
  8. 534
  9. 293
  10. 405
  11. 576
  12. 112
  13. 250
  14. 188
  15. 290
  16. 256
  17. 518
  18. 101
  19. 511
  20. 206
  21. 428
  22. 268
  23. 68
  24. 427
  25. 475
  26. 432
  27. 58
  28. 95
  29. 462
  30. 569
  31. 482
  32. 428
  33. 401
  34. 307
  35. 90
  36. 101
  37. 135
  38. 184
  39. 455
  40. 498

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