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
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