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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 954 · 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. 1.180 + 59 =
  2. 2.304 + 87 =
  3. 3.437 + 38 =
  4. 4.157 + 67 =
  5. 5.327 + 17 =
  6. 6.130 + 38 =
  7. 7.33 + 39 =
  8. 8.412 + 39 =
  9. 9.65 + 27 =
  10. 10.191 + 19 =
  11. 11.31 + 18 =
  12. 12.354 + 68 =
  13. 13.271 + 97 =
  14. 14.329 + 88 =
  15. 15.466 + 18 =
  16. 16.128 + 69 =
  17. 17.488 + 19 =
  18. 18.283 + 99 =
  19. 19.65 + 17 =
  20. 20.124 + 99 =
  21. 21.74 + 39 =
  22. 22.34 + 18 =
  23. 23.84 + 29 =
  24. 24.160 + 29 =
  25. 25.211 + 88 =
  26. 26.214 + 79 =
  27. 27.26 + 87 =
  28. 28.281 + 79 =
  29. 29.206 + 98 =
  30. 30.138 + 18 =
  31. 31.109 + 69 =
  32. 32.358 + 69 =
  33. 33.127 + 17 =
  34. 34.377 + 27 =
  35. 35.219 + 68 =
  36. 36.115 + 57 =
  37. 37.109 + 19 =
  38. 38.488 + 19 =
  39. 39.343 + 27 =
  40. 40.58 + 77 =

Answer key

  1. 239
  2. 391
  3. 475
  4. 224
  5. 344
  6. 168
  7. 72
  8. 451
  9. 92
  10. 210
  11. 49
  12. 422
  13. 368
  14. 417
  15. 484
  16. 197
  17. 507
  18. 382
  19. 82
  20. 223
  21. 113
  22. 52
  23. 113
  24. 189
  25. 299
  26. 293
  27. 113
  28. 360
  29. 304
  30. 156
  31. 178
  32. 427
  33. 144
  34. 404
  35. 287
  36. 172
  37. 128
  38. 507
  39. 370
  40. 135

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