1. I can
Identify Numerical and Variable Expressions
Write variable expressions for word phrases.

2. – Variables and Expressions A variable is a letter that stands for a number. x, y, z, a, b, c, etc……

3. A variable expression is a math phrase that uses variables (x, y, z), numerals (1, 2, 3), and operation symbols (+, /, -, *).
x + 5
z / 4
m * 26

4. Which of the expressions is a numerical expression or a variable expression?
What operation is being used?
50 – 5 c – 5
5 * c 57 / 3

5. You can translate many words for operations into symbols.
Can you think of words that would mean:
x ÷

6. Word Phrase
What it really means
Nine more that a number y
y + 9
4 less than a number n
n – 4
A number z times 3
z * 3 or 3z or 3(z)
A number a divided by 12
a / 12
5 times the quantity 4 plus a number c
5 * (4 + c) or 5(4 + c)

7. Let’s do some examples.
Write a variable expression for each word phrase:
M more than 19
Two less than a number p
The product of a number x and 10
5 less x
10 more than twice a number t

8. Today’s Homework: page 6 10 – 35, 40,41