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Published byAnnabella Newton Modified over 8 years ago

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Add and Subtract Positive and Negative Fractions and Mixed Numbers SWBAT add and subtract positive and negative fractions; add and subtract positive and negative mixed numbers

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Review: Adding integers: integers with like signs: add the absolute values and keep the sign integers with like signs: add the absolute values and keep the sign integers with unlike signs: subtract the absolute values and use the sign of the larger absolute value. integers with unlike signs: subtract the absolute values and use the sign of the larger absolute value. Subtracting integers: rewrite it as an addition problem by adding the additive inverse of the subtrahend. Follow addition rules. rewrite it as an addition problem by adding the additive inverse of the subtrahend. Follow addition rules.

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Adding and Subtracting Fractions When adding fractions you need to have common denominator. What is the LCD for 4/5 and 7/8?

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Examples -5/16 + (-5/8) 3/5 + (-4/15) 7/10 – 4/5 -2/10 – 11/20 1 3/10 – (-2/5) -2 7/12 + (-3 5/8) 1 3/5 + (-6 7/10) -3 5/6 – (-1 ¾)

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Try These -3/8 + (-5/16) -6/16 + -5/16 -6/16 + -5/16 -11/16 -11/16 3/5 + (-4/15) 9/15 + (-4/15) 9/15 + (-4/15) 5/15 = 1/3 5/15 = 1/3 26 ¼ - (-5 3/8) 26 2/8 + 5 3/8 26 2/8 + 5 3/8 31 5/8 31 5/8

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