Vocabulary
When you EVALUATE an expression you....
find the value
32 + 6 - 2 x 7
1
a = 3 b = 1/4
7a + 4b
22
What does "define a variable" tell you to do?
write a let statement
What are the two steps, in order, when you evaluate a variable expression?
substitute, simplify
When you SIMPLIFY an expression you...
perform as many operations as possible
7 x (43 – 6) ÷ 2
203
m = 4 n = 3
mn3
108
What is wrong with this let statement?
Let n = how many books Pat read in one month
it starts with "how many"
What is another name for a variable expression?
Algebraic expression
When you SUBSTITUTE, you...
replace a variable with a value
124 - 3 x (7 + 52)
28
x = 4 y = 1/4
(6x) ÷ (8y)
12
John bought a binder for $4.99 and 6 notebooks.
Define a variable and write an expression to represent the total John spent.
Let n = Cost of one notebook
6n + 4.99
(22 + 6 x 2)2
256
A variable is....
a symbol that stands for an unknown value
20 ÷ 5 x 2 + (6 + 2) x 7
64
a = 5 b = 6
3ab + (b ÷ 12)
90 ½
Write an expression for 9 less than product of a number and 8.
8n - 9
a = 2 b = 4 c = 6
ac ÷ bc
1/2
How is a verbal expression different from a numerical or variable expression?
The operation symbol is replaced with words.
(4 + 22)2 + 3(7 + 3 x 2) - 3
100
m = 3 n = 2
4m2 +(8n)÷ n2
40
Write an expression for the difference between 12 and 4 times a number
12 - 4n
In order, tell what type of expression each one shown below is:
3 more that twice a number
7n - 4
2 + 82 x 4
verbal, variable, numerical