Multiplying Fractions is way easier than adding and subtracting.

Multiplying Fractions Mr. Milano, I’m lost! 4 3 x = 7 6 YOU DO NOT NEED A COMMON DENOMINATOR

Multiplying Fractions Oh, I remember! 4 3 Oh good! x = 7 6 YOU DO NOT NEED A COMMON DENOMINATOR

Multiplying Fractions Wait, which ones? 4 3 Oh good! x = 7 6 YOU DO NOT NEED A COMMON DENOMINATOR Step 1: Multiply the numerators.

Multiplying Fractions Straight across!! 4 3 12 4 x 3 = 12 x = 7 6 YOU DO NOT NEED A COMMON DENOMINATOR Step 1: Multiply the numerators. Step 2: Multiply the denominators

Multiplying Fractions Almost there! 4 3 12 7 x 6 = 42 x = 7 6 42 YOU DO NOT NEED A COMMON DENOMINATOR Step 1: Multiply the numerators. Step 2: Multiply the denominators Step 3: Simplify!

Multiplying Fractions 4 3 12 6 / 2 7 x = = 7 6 42 This is easy! YOU DO NOT NEED A COMMON DENOMINATOR Step 1: Multiply the numerators. Step 2: Multiply the denominators Step 3: Simplify!

Adding Fractions with common denominators Step 1: Add the numerators! Step 2: Leave the Denominator alone! Step 3: Simplify!!

Adding Fractions with different denominators Problem: You can’t add fractions with different denominators. Solution: Turn fractions into equivalent fractions with the easiest common denominator

Finding the Easiest Common Denominator Multiply denominator to the opposite side (top & bottom) Example 1 1 2 + 1 3 2 2 3 3

Finding the Easiest Common Denominator Multiply denominator to the opposite side (top & bottom) Example 1 1 2 + 1 3 x 2 2 3 3 x

Finding the Easiest Common Denominator Multiply denominator to the opposite side (top & bottom) Example 1 1 2 + 1 3 x 2 2 3 3 x 3 6 2 6

Finding the Easiest Common Denominator Multiply denominator to the opposite side (top & bottom) Example 1 3 6 + 2 6 5 6

You can’t add fractions with different denominators + The Lowest Common Multiple of 2 and 3 is 6 so turn all fractions into sixths Special form of 1

Lowest common denominator is 10 so make all fractions tenths Example 2 Lowest common denominator is 10 so make all fractions tenths

Example 3: Turn both fractions into twelfths