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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 893 · 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. 1.391 + 97 =
  2. 2.47 + 37 =
  3. 3.361 + 47 =
  4. 4.345 + 18 =
  5. 5.253 + 29 =
  6. 6.145 + 98 =
  7. 7.222 + 79 =
  8. 8.111 + 97 =
  9. 9.447 + 69 =
  10. 10.67 + 99 =
  11. 11.476 + 39 =
  12. 12.235 + 29 =
  13. 13.72 + 28 =
  14. 14.441 + 89 =
  15. 15.78 + 98 =
  16. 16.119 + 49 =
  17. 17.219 + 58 =
  18. 18.59 + 27 =
  19. 19.266 + 37 =
  20. 20.391 + 68 =
  21. 21.67 + 77 =
  22. 22.375 + 39 =
  23. 23.361 + 29 =
  24. 24.246 + 69 =
  25. 25.359 + 37 =
  26. 26.119 + 97 =
  27. 27.260 + 27 =
  28. 28.293 + 48 =
  29. 29.488 + 17 =
  30. 30.300 + 28 =
  31. 31.441 + 19 =
  32. 32.291 + 17 =
  33. 33.51 + 78 =
  34. 34.212 + 48 =
  35. 35.158 + 89 =
  36. 36.416 + 17 =
  37. 37.209 + 17 =
  38. 38.442 + 67 =
  39. 39.496 + 38 =
  40. 40.473 + 38 =

Answer key

  1. 488
  2. 84
  3. 408
  4. 363
  5. 282
  6. 243
  7. 301
  8. 208
  9. 516
  10. 166
  11. 515
  12. 264
  13. 100
  14. 530
  15. 176
  16. 168
  17. 277
  18. 86
  19. 303
  20. 459
  21. 144
  22. 414
  23. 390
  24. 315
  25. 396
  26. 216
  27. 287
  28. 341
  29. 505
  30. 328
  31. 460
  32. 308
  33. 129
  34. 260
  35. 247
  36. 433
  37. 226
  38. 509
  39. 534
  40. 511

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