Add and Subtract Positive Add and Subtract Positive and Negative Fractions and Negative Fractions

and Mixed Numbersand Mixed Numbers

SWBAT add and subtract positive and SWBAT add and subtract positive and negative fractions; add and subtract negative fractions; add and subtract

positive and negative mixed numberspositive and negative mixed numbers

Review:Review:

Adding integers:Adding integers: integers with integers with likelike signs: add the signs: add the absolute absolute

valuesvalues and keep the sign and keep the sign integers with integers with unlikeunlike signs: subtract the signs: subtract the

absolute valuesabsolute values and use the sign of the larger and use the sign of the larger absolute valueabsolute value..

Subtracting integers:Subtracting integers: rewrite it as an addition problem by adding the rewrite it as an addition problem by adding the

additive inverseadditive inverse of the subtrahend. Follow of the subtrahend. Follow addition rules.addition rules.

Adding and Subtracting FractionsAdding and Subtracting Fractions

When adding fractions you need to have When adding fractions you need to have common denominatorcommon denominator. .

What is the LCD for 4/5 and 7/8?What is the LCD for 4/5 and 7/8?

ExamplesExamples

-5/16 + (-5/8)-5/16 + (-5/8)3/5 + (-4/15)3/5 + (-4/15)7/10 – 4/57/10 – 4/5-2/10 – 11/20-2/10 – 11/201 3/10 – (-2/5)1 3/10 – (-2/5)-2 7/12 + (-3 5/8)-2 7/12 + (-3 5/8)1 3/5 + (-6 7/10)1 3/5 + (-6 7/10)-3 5/6 – (-1 ¾)-3 5/6 – (-1 ¾)

Try TheseTry These

-3/8 + (-5/16)-3/8 + (-5/16) -6/16 + -5/16-6/16 + -5/16 -11/16-11/16

3/5 + (-4/15)3/5 + (-4/15) 9/15 + (-4/15)9/15 + (-4/15) 5/15 = 1/35/15 = 1/3

26 ¼ - (-5 3/8)26 ¼ - (-5 3/8) 26 2/8 + 5 3/826 2/8 + 5 3/8 31 5/831 5/8