Transcript Writing Expressions

Writing
Expressions
Expressions vs. Equations
 Expressions
use numbers,
number symbols and letters
(variables) to explain a sentence.
Equations are like expressions
except they have an equal sign.

examples

twelve divided by three


Twenty increased by eleven


12 ÷ 3
20 + 11
Thirty-seven minus a number

37 - n
Real life problem

Joey mows lawns to make some extra money. He
charges $21 for each lawn and an extra $2 per
hour. Which expression should he use to find out
how much to charge his customers?
[A] 21 + h
[B] 21 + 2·h
[C] 21 + 2
[D] 21 – 2·h
Translating words into symbols
Addition
Subtraction
Multiplication
Division
Sum
Difference
Product
Quotient
Increase
Decrease
Factors
Equally shared
More than
Less than
Times
Divided by
Plus
Minus
Multiplied by
Added to
of
Example problems

Twelve pieces of candy equally shared by
four friends


The product of seven and four


7x4
The difference of Twenty and sixteen


12 ÷ 4
20 – 16
y less than 18 times 6

18 • 6 – y
Example problems
1.
Seven decreased by five
7–5
2.
The product of four and nine
4x9
3.
The sum of a number and ten
m + 10
4.
Eight more than a number c
c+8
Example problems
5.
The quotient of twenty and two
20 ÷ 2
6.
Five minus a number
5–
7.
x
Five less than a number
x– 5
8.
x
x
Eighteen equally shared by six
18 ÷ 6
Example problems
9)
Three times the sum of a number and 5
3 x (n + 5)
10)
The quotient of m and 2 plus 7.
(m ÷ 2) + 7

four times the quantity of x minus 8
4 x (x – 8)

Eight more than the product of a number and 9
c+8