checking my answers please help

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November 8th 2010, 05:00 PM
kamie87

checking my answers please help

Hi
I just wanted someone to check my answers and make sure this is right before i submit it.
Q.The product of 25.26 and 3/8
A. 9.4725

Q. 3 1/8 divide 5/7 (fractions)
A. 3 47/56 (three and 47 over 56)

If someone can let me know if ive done this right please
Thanks
November 8th 2010, 05:34 PM
bjhopper

Hi kamie87,

One right,one wrong.

bjh
November 8th 2010, 05:50 PM
kamie87

can u tell me which one and what im doing wrong??? please please please
November 8th 2010, 05:52 PM
kamie87

ok the second one is majorly wrong.... can you tell me how to work it out? maybe a similar problem for practice?
November 8th 2010, 05:55 PM
kamie87

if i do it on the calculator i get 4 3/8 but how do i work it out without a calculator?
November 8th 2010, 06:02 PM
skeeter

$3 \frac{1}{8} \div \frac{5}{7}$

$\frac{25}{8} \div \frac{5}{7}<br />$

$\frac{25}{8} \times \frac{7}{5}$

$\frac{25 \times 7}{8 \times 5} = \frac{5 \times 7}{8 \times 1} = \frac{35}{8} = 4 \frac{3}{8}$
November 8th 2010, 06:05 PM
Wilmer

Quote:

Originally Posted by kamie87

Q. 3 1/8 divide 5/7 (fractions)

3 1/8 = 25/8 ; ok?

RULE: (a/b) / (c/d) = (a/b) * (d/c)

Wrap it up!
November 8th 2010, 06:31 PM
kamie87

thankyou for the help...
so you flip the second fraction upside down
and in the fourth line it changed from 25x7 to 5x7 and 8x5 to 8x1?? im a little lost to how that works sorry
November 8th 2010, 06:47 PM
Wilmer

Multiply and divide fractions -- A complete course in arithmetic
November 9th 2010, 10:42 AM
skeeter

Quote:

Originally Posted by kamie87

thankyou for the help...
so you flip the second fraction upside down
and in the fourth line it changed from 25x7 to 5x7 and 8x5 to 8x1?? im a little lost to how that works sorry

$\displaystyle \frac{25 \times 7}{8 \times 5} = \frac{5 \times 5 \times 7}{8 \times 5}$

so ... what happens to one of the 5's in the numerator and denominator?

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