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# 7th math formulas

### 2011-2012 7th grade math formulas

Percent proportion is/of = %/100
Percent of change proportion change /original =%/100
Sales tax 1. Original price x Tax % = Tax Amt. 2. Total amt. = original price+tax amount
tip 1. Original price x tip % (as a decimal) = tip amt. 2. Total amt. = original price + tip amt.
discount 1. original price x discount % (as a decimal) = discount amt. 2. total amt. = original price discount amt.
simple interest Interest = principal x rate x time ( I = prt )
area of a rectangle A = Base x Height or l x w
area of a triangle A = ( b x h ) /2
area of a trapezoid A = [h(b1 + b2) /2
area of a circle A = pi x r^2
circumference of a circle C = 2 x pi x r
Created by: gmeasimer