Ubtracting ractions LCM Method.

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Presentation transcript:

ubtracting ractions LCM Method

- Example 1 We need a common denominator to subtract a fraction from another.

Count by 5's 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55 Count by 11's 11, 22, 33, 44, 55, 66, 77… The first number IN COMMON that appears on both lists becomes the common denominator

Make equivalent fractions. = 11 15 = x 5 x 11 - x 5 x 11 4 Subtract. 15 - 11 = 4

- Example 2 We need a common denominator to subtract one fraction from another.

Count by 2's 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 … Count by 10's 10, 20, 30… The first number IN COMMON that appears on both lists becomes the common denominator

Make equivalent fractions. = = 5 x 1 3 x 5 - x 5 x 1 2 Subtract. 5 – 3 = 2

Try these Subtract the following 1. 2. 3.