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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 840 · 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. 1.432 + 28 =
  2. 2.50 + 39 =
  3. 3.463 + 37 =
  4. 4.437 + 67 =
  5. 5.316 + 49 =
  6. 6.274 + 37 =
  7. 7.445 + 69 =
  8. 8.56 + 79 =
  9. 9.126 + 47 =
  10. 10.180 + 99 =
  11. 11.188 + 89 =
  12. 12.499 + 47 =
  13. 13.200 + 18 =
  14. 14.472 + 17 =
  15. 15.262 + 97 =
  16. 16.231 + 99 =
  17. 17.372 + 28 =
  18. 18.369 + 79 =
  19. 19.186 + 67 =
  20. 20.361 + 79 =
  21. 21.187 + 17 =
  22. 22.341 + 28 =
  23. 23.107 + 19 =
  24. 24.367 + 68 =
  25. 25.251 + 28 =
  26. 26.465 + 67 =
  27. 27.297 + 97 =
  28. 28.203 + 97 =
  29. 29.72 + 59 =
  30. 30.204 + 78 =
  31. 31.178 + 89 =
  32. 32.112 + 57 =
  33. 33.313 + 37 =
  34. 34.364 + 37 =
  35. 35.131 + 57 =
  36. 36.185 + 79 =
  37. 37.208 + 18 =
  38. 38.25 + 17 =
  39. 39.154 + 48 =
  40. 40.198 + 69 =

Answer key

  1. 460
  2. 89
  3. 500
  4. 504
  5. 365
  6. 311
  7. 514
  8. 135
  9. 173
  10. 279
  11. 277
  12. 546
  13. 218
  14. 489
  15. 359
  16. 330
  17. 400
  18. 448
  19. 253
  20. 440
  21. 204
  22. 369
  23. 126
  24. 435
  25. 279
  26. 532
  27. 394
  28. 300
  29. 131
  30. 282
  31. 267
  32. 169
  33. 350
  34. 401
  35. 188
  36. 264
  37. 226
  38. 42
  39. 202
  40. 267

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