0-4/0-5 Operations with Fractions Goals: Add, subtract, multiply and divide fractions.

Vocabulary Numerator – top number in a fraction Denominator – bottom number in a fraction

Adding and Subtracting Fractions Two methods: Get a common denominator and add or subtract numerators. Example: 1 2 + 2 3 Use a calculator. Example: 3 5 + 7 9

IMPORTANT!!! Things to remember when using a calculator: Fractions should ALWAYS be in parenthesis Mixed numbers are put in as an addition problem To get a fraction for an answer press: MATH >FRAC

Examples Find each sum or difference. 3 5 + 1 5 3 8 − 1 3 4 5 + 7 10 2 5 − 3 4 4 5 1 24 1 1 2 − 7 20

Multiplying Fractions Two methods: Multiply across. Example: 1 2 ∙ 2 3 Use a calculator. Example: 3 5 ∙ 7 9

Dividing Fractions Two methods: Multiply by the reciprocal. Example: 4 7 ÷ 2 5 Use a calculator. Example: 2 9 ÷ 3 5

Examples Find each product or quotient. 2 5 ∙ 1 3 3 5 ∙1 1 2 1 4 ∙ 2 9 − 3 4 ∙ 3 8 2 15 9 10 1 18 − 9 32

Examples 1 3 ÷ 1 2 3 8 ÷ 2 3 − 2 3 ÷ 4 5 7 8 ÷−2 1 3 2 3 9 16 − 5 6 − 3 8

Practice On whiteboards Page P16 #11-16 Page P19 #10-15, 31-36

Homework Page P16 #17-25 Page P19 #16-21, 37-42