Adding and Subtracting Fraction Notes Ex: 1 / 8 + 3 / 8 1.If the denominators are the same, add or subtract the numerators only. 1 + 3 8 2.Simplify if.

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Presentation transcript:

Adding and Subtracting Fraction Notes Ex: 1 / / 8 1.If the denominators are the same, add or subtract the numerators only Simplify if possible. 4 = __ 8

When you have different denominators: Ex: 7 / / 2 1.Find the LCD for both denominators. The LCD of 8 and 2 is ___. 2.Write equivalent fractions using the LCD. 7 = __ 1 = __ Add or subtract. Write answer in simplest form = __ Adding and Subtracting Fraction Notes

Adding and Subtracting Mixed Numbers 1) Find the Least Common Denominator (LCD)Least Common Denominator (LCD) 2) Find the equivalent fractions. 3) Add or subtract the fractions and add or subtract the whole numbers. 4) Write your answer in lowest terms.

1.1 5 / / / / / / / / 3

What if you need to borrow? How do you know? 2 3 / / 8 Make sure you have common denominators. Take one “whole” away from the whole number, then add this one “whole” to the other side as a fraction. 2 3 / 8 = 3 / 8 + 8/ 8 = 1 11 / 8 Subtract. Adding and Subtracting Fraction Notes

2 1/4 - 3/4 2 1/4 = 1 5/4

/ / / / / / / / 3

/ / / / / / / / 2

/ / / / / / / / 9

P. O. D. 10/22/ / / / / / / / / 5

P. O. D. 10/26/ / / / / 4 _______ / / / / 6

1.List two fractions equivalent to 4 2 / / 7 = / 7 = / 5 = / 3 = P. O. D. 11/18/05

1.4 5 / / 8 = / 7 = / 7 = / 7 = / 7 = P. O. D. 11/21/05

1.4 5 / / 8 = / / 3 = / / 6 = / / 8 = P. O. D. 11/22/05

1.2 5 / / 9 = / / 4 = / / 7 = / / 10 = P. O. D. 11/28/05

1.7 1 / / / / / / 3 P. O. D. 11/29/05