Algebra
posted by Cheyenne
Pick a number. Multiply by 2. Subtract 8. Divide by 2. Add 4. What is the result? Use algebra to show why the tricks work.

MsPi_3.14159265
Try first with a number...
say 7
first multiply by 2, that is 7x2=14
subtract 8, that is 148=6
divide by 2, that is 6/2= 3
add 4, that is 3 + 4 = 7
So what happened to your original number?? 
Bosnian
x = your number
( x * 2  8 ) / 2 + 4 = x * 2 / 2  8 / 2 + 4 = x  4 + 4 = x 
Cheyenne
(7×2)8÷2+4=7
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