Write the equation
A number plus 5
Sam has 8 blocks. He has 2 more than Max. Write and solve for Max?
x+2=8
X=6
x + 4 = 10
x=6
What do we call a letter that represents an unknown number?
Variable
Write an equation for "A number plus 2 equals 5?"
x + 2 = 5
A number minus 3
x - 3
A number plus 3 equals 12. What is the number?
x + 3 = 12
x=9
x -3 = 9
x=12
A math sentence with an equal sign is called a what?
Equation
Solve: x + 10 = 14
x = 4
7 more than a number
x + 7
10 is 4 more than a number. What is the number?
x + 4= 10
x=6
x + 7 = 20
x=13
A math phrase without an equal sign is called what?
Expression
x = 7
A number decreased by 9
x - 9
Sam had 15 apples. He gives away 6 apples. How many apples does he have left?
x-6=15 OR 15 - 6=x
x=9
x - 6 =8
x=14
The number you don't know in a problem is called what?
Unknown
x + 9 = 20
x=11
A number increased by 4, then decreased by 2
x + 4 - 2
A number minus 7 equals 11?
x - 7=11
x= 18
x + 9 = 30
x= 21
What does it mean to "solve" an equation?
Find the value of the variable
Write and solve: "A number minus 5 is the same as 18."
x - 5 = 18
x= 23