Date post: | 01-Jan-2016 |
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X + XThe meal cost $12.00
10% of $12.00 is $1.20. Double that to get 20%, so the tip would be $2.40.
One way: 50% means half. 10 is half of 20.
Another way: Set up a proportion 50 = 10 50x = 1000, so x = 20. 100 x
Another way: set up an equation10 = 50% of x 10 = .5x x = 10/.5 = 20
X + X
One way: set up a proportion
x = 10 100 50
50x = 1000, so x = 20. 10 is 20% of 50.
Another way: equation10 = x 50 so x = .2, which is 20%
In your head: 10% of 150 is 15. 40% is 4 times that much, or
4 x 15 = 60.
Another way: proportion 40 = x 100x = 6000 so x = 60. 100 150
Another way: equation40% of 150 = x, so .4(150) = x, so x = 60.
X + X1.3% of children are allergic to peanuts. In a pediatric hospital with 2000 patients a year, how
many would you expect to have peanut allergies?
X + XYou could set up a proportion:
1.3 = x 100 2000100x = 2600, so x = 26 kids allergic to peanuts.
30% of Americans have hay fever. Of those, 75% find over-the-counter
allergy medications helpful. How many people in a town of 1200
would have hay fever that was NOT helped by over-the-counter
medication?
X + X30% of 1200 is 360 people with hay fever. 75% of these 360, or ¾ of them, ARE helped by over-the-counter meds. That’s 270 who ARE helped by the medicine. That leaves 360 – 270, or 90 people, who are NOT helped.
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Resources:
Picture on slides 2, 4, 6, 8, 12, 14, 16, 18Thinking Man by منتصف is licensed under CC BY-SA 4.0 خالد
Picture on slide 16 and 17Pasta salad closeup by Brynn is licensed under CC BY-SA 3.0
Picture on slide 18 and 19Som tam thai by Takeaway is licensed under CC BY-SA 3.0
Picture on slides 26 and 27No Peanuts Allergy Alert Pendant by BeInspiredDesigns is licensed under CC BY-NC 2.0; Cropped from original work.