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Decimal and Fraction Addition Review Topic 4 Decimal Addition • Whole numbers have the decimal after the one place • Line up the decimal • Fill in zeros • Try 5 + 0.3 + 2.12 + 0.243 Common Denominator • A number that can be divided evenly by both denominators is a common denominator • The smallest common denominator is the least common denominator • Find a common denominator for 7/15 and 5/12 Fraction Addition • Find the least common denominator • Raise all fractions to be added to that denominator • ADD • Simplify Example • 2 4 8 5 5 3 4 12 13 3 2 2 43 12 5 2 10 3 3 6 2 12 21 10 12 9 3 10 1 11 12 4 • Example • r and r2 are 2 not like terms. r 7r 5r 8 6 8 • Just add the 2 first two terms. 3r 28r 5r • 24 is the LCD 24 24 8 2 2 31r 5r 5r 7 1 24 r 24 8 8 Acceptable way to write • These are the same. • These are NOT the same because of the order of operations. 2x 3 5 2 x 3 3x 4 3 4 5 x