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Add by Rounding Worksheet

Speed calculation lesson 2: Add by rounding · Set 951 · 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. 1.295 + 97 =
  2. 2.225 + 47 =
  3. 3.75 + 79 =
  4. 4.52 + 78 =
  5. 5.364 + 89 =
  6. 6.263 + 39 =
  7. 7.385 + 77 =
  8. 8.345 + 18 =
  9. 9.285 + 47 =
  10. 10.85 + 27 =
  11. 11.278 + 99 =
  12. 12.369 + 39 =
  13. 13.402 + 57 =
  14. 14.403 + 78 =
  15. 15.358 + 27 =
  16. 16.300 + 77 =
  17. 17.100 + 37 =
  18. 18.498 + 88 =
  19. 19.250 + 48 =
  20. 20.104 + 97 =
  21. 21.112 + 98 =
  22. 22.71 + 69 =
  23. 23.366 + 89 =
  24. 24.352 + 99 =
  25. 25.488 + 97 =
  26. 26.446 + 87 =
  27. 27.353 + 29 =
  28. 28.105 + 27 =
  29. 29.382 + 28 =
  30. 30.224 + 69 =
  31. 31.258 + 29 =
  32. 32.78 + 57 =
  33. 33.105 + 67 =
  34. 34.102 + 79 =
  35. 35.154 + 79 =
  36. 36.98 + 58 =
  37. 37.160 + 89 =
  38. 38.202 + 77 =
  39. 39.286 + 17 =
  40. 40.56 + 97 =

Answer key

  1. 392
  2. 272
  3. 154
  4. 130
  5. 453
  6. 302
  7. 462
  8. 363
  9. 332
  10. 112
  11. 377
  12. 408
  13. 459
  14. 481
  15. 385
  16. 377
  17. 137
  18. 586
  19. 298
  20. 201
  21. 210
  22. 140
  23. 455
  24. 451
  25. 585
  26. 533
  27. 382
  28. 132
  29. 410
  30. 293
  31. 287
  32. 135
  33. 172
  34. 181
  35. 233
  36. 156
  37. 249
  38. 279
  39. 303
  40. 153

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