+130547 Suppose we had
3/12 = 1/4
To cross-multiply......I take the 3 in the numerator of the first fraction and multiply it by the denominator of the other fraction, 4. This gives me 12.
Then......I take the denominator of the first fraction, 12, and multiply it by the numerator of the second fraction, 1. This again gives me 12.
This is a good way to check to see if two ratios (fractions, in this case) are equal. If so, their cross-products are equal.
+130547 Suppose we had
3/12 = 1/4
To cross-multiply......I take the 3 in the numerator of the first fraction and multiply it by the denominator of the other fraction, 4. This gives me 12.
Then......I take the denominator of the first fraction, 12, and multiply it by the numerator of the second fraction, 1. This again gives me 12.
This is a good way to check to see if two ratios (fractions, in this case) are equal. If so, their cross-products are equal.
