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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 %(as a decimal) = tax amount 2.total amount = original price + tax amount
Tip 1.original price x tip %(as a decimal) = tip amount 2. total amount. = original price + tip amount
Discount 1.original price x discount %(as a decimal) = discount amount 2. total amount =original price =discount amount
Simple Interest Interest = principal x rate x time(i=prt)
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 x (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: 17yelvec