Multiplying and Dividing Fractions, GCM, and LCM

Today in math we reviewed multiplying and dividing fractions. To multiply fractions; you reduce them and then multiply the numerators and then the denominators. Then you simplify. If you want to multiply mixed numbers you have to change them to mixed numbers. To divide fractions, you multiply the first fraction by the second fraction's recipricle. Also, we reviewed Gcf and LCM. To find two numbers' GCF you find the prime factorization of each number and the largest number they both have in common is the GCF. To find the LCM you put the factors of each number in a venn diagram (the numbers that they have in common go in the center) and then multiply all of the numbers together.