Addition & Subtraction Equations

Front

What is an equation?

Back

An equation is a mathematical statement that shows that two expressions are equal, using an equal sign (=).

Front

What does it mean to solve an equation?

Back

To solve an equation means to find the value of the variable that makes the equation true.

Front

What is the variable in an equation?

Back

A variable is a symbol (often a letter) that represents an unknown number in an equation.

Front

What is the first step to solve the equation 120 = b - 80?

Back

Add 80 to both sides of the equation to isolate the variable b.

Front

What is the solution to the equation 120 = b - 80?

Back

b = 200.

Front

How do you find the value of c in the equation 65 = 40 + c?

Back

Subtract 40 from both sides of the equation.

Front

What is the solution to the equation 65 = 40 + c?

Back

c = 25.

Front

What is the equation to find x in 29 = 21 + x?

Back

Subtract 21 from both sides of the equation.

Front

What is the solution to the equation 29 = 21 + x?

Back

x = 8.

Front

How do you solve the equation 17 + b = 20?

Back

Subtract 17 from both sides of the equation.