Area of a triangle
1/2 base x height
Area of a circle
Pi x radius squared
Circumference of a circle
pi x diameter
a^2 + b^2 = c^2 (c is hypotenuse)
a nonnegative number that is not expressed as a fraction or a decimal
a whole number or its opposite (number line)
a number that has more than two factors
Order of operations
Parentheses, Exponents, Multiply/Divide, Add/Subtract (Please Excuse My Dear Aunt Sally)
5 x 2 = 2 x 5
(5) (a) = (a) (5)
b + 3 = 3 + b
If parentheses can be moved to group different numbers in an arithmetic problem without changing the result, then the operation is associative. Addition and multiplication are associative.
2 + (3 + 4) = (2 + 3) + 4
2 (ab) = (2a) b
5a + 5b = 5(a + b)
5(100 - 6) = (5 x 100) - (5 x 6)
The value that, when added to a number, does not change the number. For all integers, the additive identity is 0.
5 + 0 = 5
The value that, when multiplied by a number, does not change the number. For all integers, the multiplicative identity is 1.
5 x 1 = 5
The number that, when multiplied by the number, gives you the multiplicative identity (1).
1/5 is the multiplicative identity of 5
The number that, when added to the number, give you the additive identity (0).
The additive inverse of 3 is -3
Order does NOT matter
Order does matter
Please allow access to your computer’s microphone to use Voice Recording.
We can’t access your microphone!
Click the icon above to update your browser permissions above and try again
Reload the page to try again!
Press Cmd-0 to reset your zoom
Press Ctrl-0 to reset your zoom
It looks like your browser might be zoomed in or out. Your browser needs to be zoomed to a normal size to record audio.
Your microphone is muted
For help fixing this issue, see