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anonymous

  • one year ago

A stack of bricks is 3 1/2 feet high. If each brick is 1 3/4 inches high, how many bricks are in the stack? 2 12 24 28

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  1. anonymous
    • one year ago
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    @mathstudent55

  2. mathstudent55
    • one year ago
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    You need to divide 3 1/2 by 1 3/4

  3. mathstudent55
    • one year ago
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    Change each mixed numeral into a fraction, then divide the fractions.

  4. anonymous
    • one year ago
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    Explain to me how do i do that please ? @mathstudent55

  5. anonymous
    • one year ago
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    @mathstudent55

  6. anonymous
    • one year ago
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    @Hero

  7. mathstudent55
    • one year ago
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    This is the operation you need to do. |dw:1436921214687:dw|

  8. mathstudent55
    • one year ago
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    Do you know how to change a mixed numeral into a fraction?

  9. anonymous
    • one year ago
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    i flipp it ?

  10. mathstudent55
    • one year ago
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    No. We will flip the second fraction when we divide the fractions, but we're not there yet.

  11. mathstudent55
    • one year ago
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    The first step is to rewrite both mixed numerals as fractions. This is how you do it. I will use a different example, not the mixed numerals from our problem.

  12. mathstudent55
    • one year ago
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    |dw:1436921384449:dw|

  13. anonymous
    • one year ago
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    do you multiply it

  14. mathstudent55
    • one year ago
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    |dw:1436921416023:dw|

  15. anonymous
    • one year ago
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    okay so 3 1/2 = 7/2 ?

  16. mathstudent55
    • one year ago
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    |dw:1436921475247:dw|

  17. mathstudent55
    • one year ago
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    Exactly. You learn fast.

  18. anonymous
    • one year ago
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    Thank you :) You are a great teacher

  19. mathstudent55
    • one year ago
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    |dw:1436921553999:dw|

  20. mathstudent55
    • one year ago
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    Thanks. Do you follow so far? We now have rewritten both mixed numerals as fractions.

  21. mathstudent55
    • one year ago
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    Now we can do the division. To divide two fractions, rewrite the first fraction as it was. Then change the division to a multiplication. Then flip the second fraction. Now multiply the fractions you have.

  22. mathstudent55
    • one year ago
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    |dw:1436921765532:dw|

  23. mathstudent55
    • one year ago
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    |dw:1436921813528:dw|

  24. anonymous
    • one year ago
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    thank you so much

  25. mathstudent55
    • one year ago
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    To multiply fractions, multiply the numerators together and multiply the denominators together. Then reduce the fraction if possible.

  26. mathstudent55
    • one year ago
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    |dw:1436922065559:dw|

  27. mathstudent55
    • one year ago
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    You're welcome. The answer is 2 bricks.

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