Writing Expressions
Use n for the unknown number.
Write an expression that represents:
"three more than a number"
n+3
Use n for the unknown number.
Write an equation to represent:
"4 more than a number is 13"
n + 4 = 13
What is "happening to" the variable in the following equation?
m + 8 = 12
+ 8
(8 is being added to it)
Solve for m:
m-3=11
14
Solve:
5x+1=11
x=2
Use n for the unknown number.
Write an expression that represents:
"five less than a number"
n - 5
Use n for the unknown number.
Write an equation to represent:
"six less than a number is 10"
n - 6 = 10
What is the operation "happening to" n in the following equation?
n - 6 = 8
- 6
(6 is being subtracted from it)
Solve the equation:
n-7=13
n=20
Solve:
4n+3=23
n=5
Use n for the unknown number.
Write an expression that represents:
"triple a number"
3n
Use n for the unknown number.
Write an equation to represent:
"one third of a number is 22"
n/3 =22
What is the operation that is "happening to" w in the equation?
8w = 16
x8
(it is being multiplied by 8)
Solve:
4y=12
y=3
Solve:
m/2 +2=5
m=6
Use n for the unknown number.
Write an expression to represent:
"four more than double a number"
2n + 4 or 4 + 2n
Use n for the unknown number.
Write an equation to represent:
"five less than double a number is 12"
2n - 5 = 12
What is the inverse of the operation "happening to" the variable in the equation?
x/7 =5
x 7
Solve:
e/3 =12
e = 36
Solve:
-m-1=-6
m=5
Use n for the unknown number.
Write an expression that represents:
"five less than half a number"
n/2 -5
Use n for the unknown number.
Write an equation to represent:
"double a number is 5 more than the number itself"
2n = n + 5
2m = 18
divide 2
Solve:
-2m=6
m=-3
Solve:
5x=3x+8
x=4