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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 933 · 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. 1.406 + 48 =
  2. 2.111 + 17 =
  3. 3.447 + 87 =
  4. 4.169 + 37 =
  5. 5.36 + 79 =
  6. 6.250 + 39 =
  7. 7.265 + 37 =
  8. 8.29 + 98 =
  9. 9.113 + 37 =
  10. 10.213 + 78 =
  11. 11.210 + 87 =
  12. 12.362 + 37 =
  13. 13.412 + 19 =
  14. 14.233 + 88 =
  15. 15.68 + 78 =
  16. 16.105 + 19 =
  17. 17.201 + 18 =
  18. 18.318 + 27 =
  19. 19.223 + 18 =
  20. 20.163 + 99 =
  21. 21.283 + 48 =
  22. 22.139 + 39 =
  23. 23.45 + 79 =
  24. 24.167 + 59 =
  25. 25.68 + 49 =
  26. 26.492 + 57 =
  27. 27.342 + 28 =
  28. 28.342 + 69 =
  29. 29.268 + 47 =
  30. 30.321 + 17 =
  31. 31.293 + 17 =
  32. 32.137 + 47 =
  33. 33.51 + 88 =
  34. 34.76 + 37 =
  35. 35.70 + 77 =
  36. 36.308 + 98 =
  37. 37.464 + 98 =
  38. 38.79 + 97 =
  39. 39.321 + 19 =
  40. 40.111 + 89 =

Answer key

  1. 454
  2. 128
  3. 534
  4. 206
  5. 115
  6. 289
  7. 302
  8. 127
  9. 150
  10. 291
  11. 297
  12. 399
  13. 431
  14. 321
  15. 146
  16. 124
  17. 219
  18. 345
  19. 241
  20. 262
  21. 331
  22. 178
  23. 124
  24. 226
  25. 117
  26. 549
  27. 370
  28. 411
  29. 315
  30. 338
  31. 310
  32. 184
  33. 139
  34. 113
  35. 147
  36. 406
  37. 562
  38. 176
  39. 340
  40. 200

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