2011-2012 7th grade math formulas
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Percent proportion | is/of = %/100
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| Percent of change proportion | change /original =%/100
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| Sales tax | 1. Original price x Tax % = Tax Amt. 2. Total amt. = original price+tax amount
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| tip | 1. Original price x tip % (as a decimal) = tip amt. 2. Total amt. = original price + tip amt.
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| discount | 1. original price x discount % (as a decimal) = discount amt. 2. total amt. = original price discount amt.
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| simple interest | Interest = principal x rate x time ( I = prt )
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| area of a rectangle | A = Base x Height or l x w
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| area of a triangle | A = ( b x h ) /2
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| area of a trapezoid | A = [h(b1 + b2) /2
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| area of a circle | A = pi x r^2
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| circumference of a circle | C = 2 x pi x r
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Created by:
gmeasimer
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