Shared Flashcard Set

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Percents
Percent errors, cross multiplying
15
Mathematics
7th Grade
02/06/2011

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Cards

Term
Similar Figures
Definition

TriangleABC is similar to TriangleDEF; solve for A

 

BC = EF

AB    DE

9 = 6

x    8

x(6) = 8(9)

6x = 72

6      6

x = 12

Term
Triangle
Definition

a=1/2b*h; solve for h

2a = b* h

b     b   

2a=h

b

Term
Density
Definition

d=m/v

m=28

v=4

d=28/4

d=7

Term
Distance
Definition

d=rt

r=12

t=3

d= (12)(3)

d=36

Term
More than 1 variable
Definition

ax+b=c; solve for x

-b -b             

ax = c-b               

 a      a                

  x=  c-b                

a

Term
Cross Multiplication #1
Definition

w = -6

   4.5    5    

4.5 (6) = 5(w)   

-27 = 5w 

 5       5  

-5.4 = w

w= -5.4

Term
Cross Multiplication #2
Definition

z+3 = z+4

4        6

4(z+4) = 6(z+3)

4z + 16 = 6z + 18

-4z          -4z        

-16 = 2z + 18

-18          -18

-34 = 2z

2      2

-17 = z

z= -17

Term
Unit Rate
Definition

cost             $1.56

ounces (unit)         48 oz       

$.0325/oz

unit rate- $.03 per oz

Term
Proportion
Definition

n = is

100  of

Term
Percent Change
Definition

amount of change

original amount

Term
Decrease
Definition

original - new

original

Term
Increase
Definition

new - original

original

Term
Percent Error
Definition

greatest possible error

measurement

Term
Volume Percent Error
Definition

greater difference

measurement

Term
Difference
Definition

maximum - measured

measured - minimum

 

(answer has to be positive)

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