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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 967 · 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. 1.65 + 38 =
  2. 2.53 + 99 =
  3. 3.28 + 59 =
  4. 4.29 + 27 =
  5. 5.390 + 47 =
  6. 6.362 + 29 =
  7. 7.377 + 59 =
  8. 8.229 + 48 =
  9. 9.486 + 49 =
  10. 10.30 + 77 =
  11. 11.240 + 87 =
  12. 12.129 + 99 =
  13. 13.374 + 28 =
  14. 14.66 + 98 =
  15. 15.175 + 87 =
  16. 16.387 + 89 =
  17. 17.483 + 17 =
  18. 18.152 + 29 =
  19. 19.267 + 39 =
  20. 20.39 + 49 =
  21. 21.51 + 38 =
  22. 22.282 + 99 =
  23. 23.208 + 99 =
  24. 24.259 + 19 =
  25. 25.190 + 29 =
  26. 26.490 + 99 =
  27. 27.57 + 29 =
  28. 28.58 + 58 =
  29. 29.473 + 89 =
  30. 30.314 + 57 =
  31. 31.426 + 28 =
  32. 32.347 + 88 =
  33. 33.353 + 69 =
  34. 34.56 + 79 =
  35. 35.388 + 59 =
  36. 36.443 + 48 =
  37. 37.473 + 89 =
  38. 38.75 + 98 =
  39. 39.110 + 77 =
  40. 40.193 + 47 =

Answer key

  1. 103
  2. 152
  3. 87
  4. 56
  5. 437
  6. 391
  7. 436
  8. 277
  9. 535
  10. 107
  11. 327
  12. 228
  13. 402
  14. 164
  15. 262
  16. 476
  17. 500
  18. 181
  19. 306
  20. 88
  21. 89
  22. 381
  23. 307
  24. 278
  25. 219
  26. 589
  27. 86
  28. 116
  29. 562
  30. 371
  31. 454
  32. 435
  33. 422
  34. 135
  35. 447
  36. 491
  37. 562
  38. 173
  39. 187
  40. 240

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