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18 terms

IA, Ch 2: Equations

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Addition Property
If a=b, then a+c=b+c, so you can add 2 sides of an equation by the same number
Multiplication Property
If a=b, then ac=bc, so you can multiply 2 sides of an equation by the same number
Identity Property of Addition
a + 0 = a
Identity Property of Multiplication
a * 1 = a
Cross Products Property
multiply across both ways, the answers are equal
reciprocal
a pair of numbers whose product is 1: the reciprocal of 2/3 is 3/2
literal equation
an equation with mostly/all variables such as a formula
unit rate
a rate that has a denominator of 1 used to compare different rates
conversion
changing the unit of measurement, ex: changing from inches to yards
proportion
two equal fractions
similar
shapes with the same angles but different sizes (use proportions to solve)
map scale
shows the ratio between distances on a map and actual distances
percent proportion
for finding the percent of a number: part/base=%/100. is->part, of->base, percent->%
simple interest
extra money earned/owed for loaning/borrowing money. I = prt
principle
the starting amount borrowed or loaned
rate
(1) a ratio that compares two quantities measured in different units, (2) the percent earned in interest
percent of change
the percent a quantity increases or decreases from its original amount, use the percent proportion then add/subtract
relative error
ratio of errror in measurement to the approximate measurement: (measured-actual) ÷ actual