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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 945 · 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. 1.151 + 17 =
  2. 2.292 + 39 =
  3. 3.172 + 57 =
  4. 4.480 + 59 =
  5. 5.148 + 27 =
  6. 6.310 + 19 =
  7. 7.490 + 69 =
  8. 8.441 + 49 =
  9. 9.136 + 19 =
  10. 10.174 + 67 =
  11. 11.272 + 19 =
  12. 12.423 + 38 =
  13. 13.84 + 37 =
  14. 14.347 + 37 =
  15. 15.146 + 98 =
  16. 16.59 + 67 =
  17. 17.133 + 37 =
  18. 18.454 + 47 =
  19. 19.137 + 98 =
  20. 20.490 + 19 =
  21. 21.163 + 19 =
  22. 22.419 + 19 =
  23. 23.89 + 17 =
  24. 24.163 + 37 =
  25. 25.231 + 89 =
  26. 26.38 + 47 =
  27. 27.141 + 17 =
  28. 28.235 + 29 =
  29. 29.275 + 27 =
  30. 30.312 + 37 =
  31. 31.486 + 67 =
  32. 32.28 + 39 =
  33. 33.234 + 68 =
  34. 34.236 + 79 =
  35. 35.86 + 37 =
  36. 36.200 + 98 =
  37. 37.281 + 19 =
  38. 38.405 + 58 =
  39. 39.402 + 48 =
  40. 40.494 + 77 =

Answer key

  1. 168
  2. 331
  3. 229
  4. 539
  5. 175
  6. 329
  7. 559
  8. 490
  9. 155
  10. 241
  11. 291
  12. 461
  13. 121
  14. 384
  15. 244
  16. 126
  17. 170
  18. 501
  19. 235
  20. 509
  21. 182
  22. 438
  23. 106
  24. 200
  25. 320
  26. 85
  27. 158
  28. 264
  29. 302
  30. 349
  31. 553
  32. 67
  33. 302
  34. 315
  35. 123
  36. 298
  37. 300
  38. 463
  39. 450
  40. 571

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