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Mathematics 7 Online
OpenStudy (anonymous):

PLEASE help! Thanks so much!!

OpenStudy (anonymous):

OpenStudy (anonymous):

What is 7*3 and 9*5?

OpenStudy (anonymous):

63/15 @JosiahG

OpenStudy (anonymous):

The answer should be 21 and 45, written as 21/45. Do you understand how I got that?

OpenStudy (anonymous):

Well I got 63/15 because 7*9 is 63 and 5 time 3 is 15. all I have to do is convert. But I guess I got it wrong.

OpenStudy (anonymous):

\[-\frac{7}{\cancel{9}^3}\times \frac{\cancel 3^1}{5}=-\frac{7}{15}\]

OpenStudy (anonymous):

Oh, there's the issue. You're supposed to multiply the top numbers (numerators) and the bottom numbers (denominators) together, not the same ones on the fraction.

OpenStudy (anonymous):

Ohh okay thanks.

OpenStudy (anonymous):

what about 3?

OpenStudy (anonymous):

First, convert the mixed number into a fraction form so you can multiply it. Do you know how to do that?

OpenStudy (anonymous):

yes.

OpenStudy (anonymous):

its 8/3

OpenStudy (anonymous):

Correct. Now what's 8/3 * 9/1?

OpenStudy (anonymous):

so i do 8 times 3 right?

OpenStudy (anonymous):

Nono, you're supposed to multiply like this: \[\frac{ 8 }{ 3 } * \frac{ 9 }{ 1 }\]

OpenStudy (anonymous):

Multiply 8 * 9 and then 3 * 1

OpenStudy (anonymous):

okay sorry.

OpenStudy (anonymous):

No worries :) Then what did you get as the answer?

OpenStudy (anonymous):

72/3.

OpenStudy (anonymous):

Then what can you simplify that as?

OpenStudy (anonymous):

so turn it into a mixed?

OpenStudy (anonymous):

It wouldn't be a mixed number in this case, because 72/3= 24

OpenStudy (anonymous):

oh.

OpenStudy (anonymous):

but y cause 72 is larger than 3??

OpenStudy (anonymous):

Basically, the fraction means divide, so \[\frac{ 72 }{ 3 } = 24\]

OpenStudy (anonymous):

ohhhhh I see.

OpenStudy (anonymous):

Awesome, don't hesitate to ask more questions :)

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