I don't know this either

Multiply the denominator by the top and change the numerator to that number.

4a(13-9b);a=12 and b=1/3

Multiply by 3 or divide by 1/3 to change it to 1.

3*(1/3) = 1 = (1/3)/(1/3)

To change the fraction to a decimal fraction, divide the numerator (1) by the denominator (3). You will get the repeating decimal 0.333333333...

3*(1/3) = 1 = (1/3)/(1/3)

To change the fraction to a decimal fraction, divide the numerator (1) by the denominator (3). You will get the repeating decimal 0.333333333...