A letter or symbol used to represent an unknown number.
Variable
100
S+7=10
S=3
100
2A=10
A=5
100
6+a-2=6
A=2
100
Frank goes to the store with 9 dollars and comes out with 5 dollars but on the way home Frank loses some money when Frank gets home he has 2 dollars how much money did frank lose?
Frank lost 3 dollars
200
A combination of expression with an equal sign in the middle.
Equation
200
A-3=2
A=5
200
q÷10=3
Q=30
200
2p+4=16
P=6
300
A combination of numbers and variable or a combination of operations.
Expression
300
D+4-2=10
D=8
300
D5=45
D=9
300
2a÷4=2
A=4
400
A number that is added or subtracted to a variable.