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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 947 · 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. 1.272 + 18 =
  2. 2.173 + 67 =
  3. 3.74 + 89 =
  4. 4.246 + 79 =
  5. 5.483 + 37 =
  6. 6.313 + 38 =
  7. 7.407 + 77 =
  8. 8.74 + 38 =
  9. 9.464 + 48 =
  10. 10.274 + 97 =
  11. 11.54 + 79 =
  12. 12.329 + 98 =
  13. 13.57 + 47 =
  14. 14.91 + 19 =
  15. 15.82 + 27 =
  16. 16.316 + 77 =
  17. 17.108 + 28 =
  18. 18.60 + 27 =
  19. 19.302 + 29 =
  20. 20.328 + 57 =
  21. 21.110 + 98 =
  22. 22.95 + 89 =
  23. 23.416 + 87 =
  24. 24.426 + 59 =
  25. 25.112 + 58 =
  26. 26.234 + 79 =
  27. 27.84 + 58 =
  28. 28.247 + 67 =
  29. 29.152 + 29 =
  30. 30.276 + 29 =
  31. 31.414 + 99 =
  32. 32.240 + 37 =
  33. 33.55 + 77 =
  34. 34.252 + 17 =
  35. 35.216 + 49 =
  36. 36.113 + 99 =
  37. 37.460 + 48 =
  38. 38.304 + 37 =
  39. 39.366 + 98 =
  40. 40.488 + 18 =

Answer key

  1. 290
  2. 240
  3. 163
  4. 325
  5. 520
  6. 351
  7. 484
  8. 112
  9. 512
  10. 371
  11. 133
  12. 427
  13. 104
  14. 110
  15. 109
  16. 393
  17. 136
  18. 87
  19. 331
  20. 385
  21. 208
  22. 184
  23. 503
  24. 485
  25. 170
  26. 313
  27. 142
  28. 314
  29. 181
  30. 305
  31. 513
  32. 277
  33. 132
  34. 269
  35. 265
  36. 212
  37. 508
  38. 341
  39. 464
  40. 506

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