fractions are a common term in elementary days but it is as common to the real world. Although it may not seem to be that used, it is important to relearn this lessons the addition, subtraction, multiplication and division of fractions.
Sample problems:
At a wedding, the girls ate 3 1/2 slices of cake and the boys ate 6 1/2 of sliced cake. How many cakes were eaten at the wedding?
Solution: 3 1/2 + 6 1/2
turn the mixed number into improper 2*3+1 = 7/2 and 2*6+1 = 13/2
since both are the same denominator just add them
==== 10 slices of cake
Rizza bought 2 1/2 gallons of water and gave 2/4 of the water to the neighbor. How much water is left?
Solution: 2 1/2 - 2/4
turn the mixed number into improper 2*2+1 = 5/2
find their lcd which is 4, then 4/2*5 = 10/4
4/4*2 = 2/4
subtract the two number
==== 2 gallons
Ms. Go has a lemonade stand. She used 4/5 bags of lemonade on friday and on saturday, she used 1/2 as many lemonades on friday. How many bags of lemonade did she use on saturday?
Solution: 4/5*1/2
in multiplication, just multiply it like normal... 4*1 and 5*2
==== 4/10, simplify then 2/5
1/8 of the original cake is left on the refrigerator. If there are 4 siblings that will share on it. How much cake per sibling will have?
Solution: 1/2 / 4
in division it's like multiplication but you will invert the 2nd number so 1/8 * 1/4
==== 1/8 cake per sibling
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Prof. Cris Paner
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