1. Writing expressions Objective:
1. Write verbal phrases and sentences as simple as algebraic expressions.

2. 4.2 Writing Expressions
An algebraic expression is an expression that contains a variable. For example: x – 4 or 5(n+3)
When solving a problem you may have to translate words or phrases into algebraic expressions.
The following chart shows the operations that may be suggested by words or phrases:
Addition
Subtraction
Multiplication
Division
plus
minus
Times
Divided by
sum
difference
product
quotient
More than
Less than
Double (× 2)
Triple (× 3)
Half of (÷2)
Increased by
Decreased by by
Separate equally…
Gain of
Less of
Twice (× 2)
per

3. Examples Write an algebraic expression for each phrase.
Five less than a number C
Four times the sum of a number N and 3.
Six more than a number X
Write a phrase for each algebraic expression.
X + 4
2. 11(5-R)
3. 2K +6

4. homework Write a phrase for each algebraic expression.
5. 4a + 2b
Write an algebraic expression for each phrase.
Fifteen increased by T
A number M decreased by ten
The product of R and eight
Five years more than Luis
Twice as many oranges.