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anonymous

  • one year ago

How do you do 1.5/2.5 of 15?

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  1. phi
    • one year ago
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    "of" means multiply \[ \frac{1.5}{2.5} \cdot 15 \] to get rid of the decimals, you can multiply top and bottom by 10 \[ \frac{15}{25} \cdot 15 \] can you finish?

  2. phi
    • one year ago
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    I would first simplify the fraction by dividing top and bottom by 5 what do you get ?

  3. anonymous
    • one year ago
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    like what is 1.5/2.5 of 15

  4. phi
    • one year ago
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    re-read my post more carefully.

  5. phi
    • one year ago
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    do you know how to simplify 15/25 by dividing the top number by 5 and the bottom number by 5?

  6. anonymous
    • one year ago
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    you get 3/5

  7. phi
    • one year ago
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    yes, that means the problem is \[ \frac{3}{5} \cdot 15 \] notice you can simplify more by dividing the bottom by 5 and the 15 (which is up top) by 5

  8. anonymous
    • one year ago
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    45/75

  9. anonymous
    • one year ago
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    The end answer is 9 but how do I get it?

  10. phi
    • one year ago
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    when you multiply fractions you multiply top times top and bottom times bottom if you have a whole number like 15, write it as 15/1 so it has a "bottom" but it is better to first simply first. you have \[ \frac{ 3}{5} \cdot \frac{15}{1} \\ \frac{3 \cdot 15}{5\cdot 1}\] I would not multiply 5*15 up top right away instead, divide the bottom by 5 and the top by 5 to get smaller numbers

  11. anonymous
    • one year ago
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    But im not multiplying

  12. anonymous
    • one year ago
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    Im trying to find out what is 1.5/2.5 out of 15

  13. anonymous
    • one year ago
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    and how to work it out

  14. anonymous
    • one year ago
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    the end answer is 9

  15. anonymous
    • one year ago
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    but how do I get it?

  16. phi
    • one year ago
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    English is confusing when describing math (which is why equations are easier to understand .. once you learn how) but you can get the idea this way: what is 1/2 of 2 ? notice the answer is 1. and 1/2 * 2 is also 1 It turns out the "of" means multiply

  17. anonymous
    • one year ago
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    Oh ok

  18. phi
    • one year ago
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    so try to simplify \[ \frac{3 \cdot 15}{5\cdot 1} \] by dividing top and bottom by 5

  19. anonymous
    • one year ago
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    3/3

  20. anonymous
    • one year ago
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    Cross multiply?

  21. phi
    • one year ago
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    in the bottom you have a 5. divide by 5 you get 1 up top you have a 15 what is 15/5 ?

  22. phi
    • one year ago
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    Once you learn the idea you will be able to do these problems

  23. anonymous
    • one year ago
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    3

  24. phi
    • one year ago
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    what we did was simplify \[ \frac{3 \cdot 15}{5\cdot 1} = \frac{3 \cdot 3}{1\cdot 1} \] now you can do the multiply and divide and get a simple number.

  25. anonymous
    • one year ago
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    im so confused

  26. anonymous
    • one year ago
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    How you get a one

  27. phi
    • one year ago
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    you could have done \[ \frac{3 \cdot 15}{5\cdot 1} = \frac{45}{5} \] and simplify to get 9 but it's easier for me to divide the 5 into the 15 right away

  28. phi
    • one year ago
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    if you have \[ \frac{15}{5} \] you can divide the top by 5 and the bottom by 5 to get \[ \frac{3}{1} \]

  29. anonymous
    • one year ago
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    Thats easier for me. Thank you

  30. phi
    • one year ago
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    maybe. but notice if you had \[ \frac{256}{32} \] and no calculator. It should be clear you can divide top and bottom by 2 so you could simplify the problem to \[ \frac{128}{16} \] and then divide top and bottom by 2 again \[ \frac{64}{8} \] and now you might notice 64/8 is 8

  31. phi
    • one year ago
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    but if you did not notice 64/8 is 8 you could simplify by dividing top and bottom by 2 to get 32/4 and then 16/2 and then 8/1 or just 8

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