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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 966 · 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. 1.443 + 19 =
  2. 2.332 + 29 =
  3. 3.478 + 79 =
  4. 4.402 + 39 =
  5. 5.420 + 47 =
  6. 6.199 + 78 =
  7. 7.42 + 59 =
  8. 8.59 + 17 =
  9. 9.115 + 29 =
  10. 10.343 + 58 =
  11. 11.415 + 88 =
  12. 12.353 + 98 =
  13. 13.278 + 28 =
  14. 14.407 + 58 =
  15. 15.217 + 18 =
  16. 16.50 + 57 =
  17. 17.436 + 18 =
  18. 18.280 + 59 =
  19. 19.485 + 27 =
  20. 20.358 + 17 =
  21. 21.148 + 49 =
  22. 22.495 + 98 =
  23. 23.383 + 87 =
  24. 24.82 + 17 =
  25. 25.305 + 98 =
  26. 26.404 + 17 =
  27. 27.210 + 27 =
  28. 28.320 + 38 =
  29. 29.415 + 37 =
  30. 30.236 + 39 =
  31. 31.223 + 78 =
  32. 32.400 + 99 =
  33. 33.241 + 97 =
  34. 34.298 + 28 =
  35. 35.75 + 28 =
  36. 36.100 + 67 =
  37. 37.65 + 57 =
  38. 38.275 + 57 =
  39. 39.181 + 58 =
  40. 40.281 + 38 =

Answer key

  1. 462
  2. 361
  3. 557
  4. 441
  5. 467
  6. 277
  7. 101
  8. 76
  9. 144
  10. 401
  11. 503
  12. 451
  13. 306
  14. 465
  15. 235
  16. 107
  17. 454
  18. 339
  19. 512
  20. 375
  21. 197
  22. 593
  23. 470
  24. 99
  25. 403
  26. 421
  27. 237
  28. 358
  29. 452
  30. 275
  31. 301
  32. 499
  33. 338
  34. 326
  35. 103
  36. 167
  37. 122
  38. 332
  39. 239
  40. 319

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