Q: How you use the algorithm when multiplying fractions by fractions?

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2 + 2 x 5 x 6 x 8 x 7 is the algorithm for that

Multiply straight across and cross reduce when necessary

definition of multiplying fractions?

Multiplying fractions is all about division

it is euclidean algorithm...

probably to multiply easier

When multiplying fractions the algorithm to use is: multiply the numerators and multiply the denominators to create a new fraction. Thus 3/8 * 3/5 = (3*3)/(8*5) = 9/40.

LCD

The algorithm is A/B * C/D = AB/CD.

Fractions and decimals are usually rational numbers. Besides, multiplying rational and irrational numbers is also similar.

When multiplying 2 fractions, we multiply the two numerators together and the two denominators together.

The answer to this question depends on the multiplication algorithm you are working with. If you are working with an algorithm for multiplying fractions, the answer of why it works the way it does is going to be different than if you are multiplying whole numbers. If you are looking to explain multiplication algorithms to young children (and even to explain algorithms to older children or to better understand them yourself), it is useful to use physical objects and play with multiplication. Once you work out a few of the type of problem you are doing (or a scaled down version if you are working with large numbers) it will likely become clearer to you why it works the way it does.