Vocabulary
the name for the unknown number that is represented with a letter
variable
2x + 5x - X
6x
3x + 9 = 30
x = 7
What do you call a comparison of two numbers by division?
A Ratio
Mental Math
98 + 99
197
the name for a number whose value will always remain the same (no variable)
constant
2x - 5x - (-x)
-2x
4(2x-5) = 60
x = 10
Are 1/2, 16/36 equivalent ratios?
Yes
Mental Math
3 x 23
24
the number in front of a variable in a variable term
EX: 5x (what is the 5 called?)
co-efficient
2x·5x
10x2
x/3 + 5 = 20
x = 5
If two ratios are equivalent they are __________ ratios.
Proportionate
Mental Math
8 x 120
960
Numbers, symbols and operations (such as + and ×) grouped together that represent the value of something
expression
2xy - 8x + 2(x + y)
2xy - 6x + 2y
3x + 10 = 2x
x = 5
Find X (-3/x) = (2/8)
-12
Mental Math
What's the GCF of 24 and 80?
8
A mathematical expression that shows the value of the expression using an equal sign
equation
3x(x + 2y) - 6xy
3x2
3x - 6 = 5x - 6 - 2x
Infinite solutions
Find X (x+1/4) = (3/4)
X = 2
Mental Math
Isaiah said a bad word in front of Mr. Steiner and got put in timeout starting at 12:25 p.m. He was done with his timeout at 1:10 p.m. How long was his timeout?
45 Minutes