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# 7th math formulas

### 2011-2012 7th grade math formulas

percent proportion is/of = percent/100
percent of change proportion percent proportion
sales tax 1. original price x tax % (as a decimal) = tax amt. 2. total amt. = original price + tax amt.
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 amount
simple intrest Interest = principle x rate x time (I = pot)
area of a rectangle area = base x height or length x width
area of a triangle Area = (base x height)/2
area of a trapezoid Area = (height(base 1 + base 2))/2
area of a circle Area = Pi x radius^2
circumference of a circle Circumference = 2 x pi x radius
Created by: zelda99