Download 1 - Humble ISD

1.1– Variables and Expressions
variable – letter or symbol used to represent a value that can
change
constant – value that does not change
numerical expression – collection of numbers operations and
grouping symbols
algebraic expression – mathematical sentence containing variables
evaluate – find the value of an expression
Ex. – Evaluate the expression for x = 8 and y = 5
x+y
8 + 5 = 13
Translating Words into Symbols
Addition
Plus
Sum
Increased by
More than
x plus 6
The sum of x and 6
A number increased by 6
6 more than a number
Subtraction
Difference
Decreased by
Minus
*Less than
The difference of a number and 7
A number decreased by 7
A number minus 7
7 less than a number
x+6
x-7
Multiplication
Times
Product
Of
6 times a number Product
The product of 6 and a number
1
of a number
2
6x
x
2
Division
Divided by
A number divided by 4
Quotient of
The quotient of a number and 4
x
4
**The phrases “a number” or “some number” refer to the variable