Review 3.5 11/12 + 7/12 5 2/5 – 3 9/5 -9b/18 + 7b/18 -5/21w – 16/21w

Adding/Subtracting Unlike Fractions Objective: students will be able to find a common denominator. With that they will be able to add/subtract fractions with unlike denominators.

Least Common Denominator Least common Denominator (LCD): Lowest shared multiple. 8, 12 2, 7

Find the least common multiple 2, 9 4, 5 10, 15 6, 7

Information Different denominator Ex: -2/3 + 3/4 5/11 – 2/3 Find LCD Change numerator Follow other addition rules Ex: ¼ + 2/3 3/12 + 8/12 = 11/12 Ex: -2/3 + 3/4 5/11 – 2/3

ST: Examples 7/10 – 4/5 -4/6 + 7/9

Solve 2/5 + 1/6 -4/5 + 1/9 ¾ - 2/3 5/6 – 1/4

Mixed numbers Steps: 3 5/9 + 2 1/6 Convert to improper Find LCD Solve/convert to mixed 3 5/9 + 2 1/6

St: Examples 4 7/10 + (-1 1/5) -3 3/7 – 2 3/14

Variables a/2 – a/6 5a/3 – a/6

ST: examples 4b/8 + b/12 10r/11 – r/8

Wrap-up Questions/comments Hw: workbook pg. 37