Transcript Lesson 1.7

Lesson 1.1
Expressions and Variables
OBJ: To translate verbal
phrases into expressions.
Definitions
• Numerical Expression – an expression
containing only numbers and operations.
• Variable – a letter used to represent one or
more numbers.
• Variable Expression – an expression
containing numbers, variables, and
operations.
Words meaning…
•
•
•
•
•
•
•
ADDITION
Sum
Plus
Total
More than
Increased by
Added to
•
•
•
•
•
•
•
•
SUBTRACTION
Difference
Less than
Less
Minus
Decreased by
Fewer than
Subtracted from
Words meaning…
•
•
•
•
•
•
MULTIPLICATION
Times
Product
Multiplied by
Of
Twice
•
•
•
•
DIVISION
Quotient
Divided by
Divided into
Sample Problems
Translate each phrase by using a variable
•
•
•
•
•
3 times the sum of 7 and a number y.
2 dollars less than Judy had yesterday
Twice a number
25 percent of a number
4 less than the quantity 6 times a number.
Try These
1. Fifteen decreased by 4 times a number
2. Twice the sum of 6 and a number
3. The difference of 5 and a number divided
by 6
4. 5 divided by the square of a number
5. If Chris can solve x algebraic equations
per minute, how many equations can he
solve in four minutes?