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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 982 · 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. 1.118 + 98 =
  2. 2.124 + 77 =
  3. 3.324 + 57 =
  4. 4.301 + 17 =
  5. 5.289 + 17 =
  6. 6.121 + 59 =
  7. 7.111 + 77 =
  8. 8.347 + 38 =
  9. 9.191 + 79 =
  10. 10.431 + 57 =
  11. 11.32 + 17 =
  12. 12.216 + 67 =
  13. 13.398 + 98 =
  14. 14.48 + 27 =
  15. 15.418 + 97 =
  16. 16.491 + 27 =
  17. 17.75 + 68 =
  18. 18.395 + 47 =
  19. 19.302 + 58 =
  20. 20.402 + 67 =
  21. 21.214 + 97 =
  22. 22.313 + 29 =
  23. 23.368 + 27 =
  24. 24.239 + 57 =
  25. 25.152 + 49 =
  26. 26.395 + 37 =
  27. 27.449 + 77 =
  28. 28.113 + 27 =
  29. 29.188 + 59 =
  30. 30.378 + 58 =
  31. 31.102 + 28 =
  32. 32.451 + 77 =
  33. 33.203 + 37 =
  34. 34.454 + 58 =
  35. 35.182 + 27 =
  36. 36.465 + 39 =
  37. 37.239 + 38 =
  38. 38.116 + 28 =
  39. 39.435 + 29 =
  40. 40.490 + 77 =

Answer key

  1. 216
  2. 201
  3. 381
  4. 318
  5. 306
  6. 180
  7. 188
  8. 385
  9. 270
  10. 488
  11. 49
  12. 283
  13. 496
  14. 75
  15. 515
  16. 518
  17. 143
  18. 442
  19. 360
  20. 469
  21. 311
  22. 342
  23. 395
  24. 296
  25. 201
  26. 432
  27. 526
  28. 140
  29. 247
  30. 436
  31. 130
  32. 528
  33. 240
  34. 512
  35. 209
  36. 504
  37. 277
  38. 144
  39. 464
  40. 567

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