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# 7th math fromulas

### 2011-2012 7th grade math formulas

% proportion is/of=%/100
% of change propportion change/original=%/100
sales tax 1.original price tax% (as a decimal) =tax amt. 2. total amt.= original price + tax amt
tip 1.original price tax% (as a decimal) =tax amt. 2. total amt.= original price + tax amt
discount 1.original price x discount%(as a decimal)=discount amt 2.total =original price
simple interest interest= principal x rate x time(i=prt)
area of a rectangle area=(base x height)
area of a triangle area=(base x height)/2
area of a trapezoid area=(height(base 1+base2))/2
area of a circle area= pi x radius^2
circumference of a circle circumference= 2 x pi
Created by: nicki 1001