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Q: When you multiply fractions why do you multiply the fractions strait across?

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When you add or subtract fractions you cross multiply and when you multiply or divide fractions you across multiply.

You multiply the numerators across and put that as the numerator of your answer, then multiply the denominators of the fractions across the put that as the denominator of your answer. It is very easy.

you multiply the top numbers straight across, then you multiply the bottom numbers straight across

You multiply straight across. Let's take one half and two halves for example. Multiply across, and you get three quarters.

If you have x/y multiplied by a/b then you get xa/yb. You just multiply across the top and bottom.

When you multiply fractions just line them up (denominator and denominator, numerator and numerator) then multiply across. Simplify.

no. you can multiply straight across in fraction multiplication

Well you don't you just multiply right across lets say the problem was 1/4 * 1/2 it would 1/8.So you multiply across.

multiply and divide fractions!-.-

To divide fractions, turn the second fraction upside down and multiply across.

make each fraction a improper fraction the flip the second fraction and multiply straight across then simplify

Multiply straight across and cross reduce when necessary

No, you cannot use models to multiply fractions!!

Just straight across. 1/3 * 1/13 = 1/39 =======and with any multiplication of fractions

Take the 2nd fraction, switch the denominator with the numerator, multiply across, simplify.

You multiply the fractions

No! You can multiply fractions without common denominators. For example: 2/4 + 7/1 Multiply straight across. The answer is then 14/4 or 3.5

The dissimilarity of the fractions doesn't matter. To multiply two fractions, multiply the numerators together, then the denominators, then put the new numerator over the new denominator. Simplify if you can. To divide fractions, invert the second fraction and multiply as just described.

Yes you do.

It is approximately 240 km across Bass Strait

First you change them into improper fractions. Then you multiply the numerator and the denamanator straight across. ;)

When you divide by fractions, you invert and multiply.

yes. you multiply the numerator and denominator

Yes.

Yes, there are times when you multiply fractions.