Solving One Step Addition and Subtraction Equations

Front

What is a one-step addition equation?

Back

A one-step addition equation is an equation that can be solved by adding a number to both sides to isolate the variable. For example, in the equation x + 5 = 10, you can subtract 5 from both sides to find x.

Front

What is a one-step subtraction equation?

Back

A one-step subtraction equation is an equation that can be solved by subtracting a number from both sides to isolate the variable. For example, in the equation x - 3 = 7, you can add 3 to both sides to find x.

Front

Solve the equation: x + 12 = 25

Back

x = 13

Front

Solve the equation: x - 4 = 10

Back

x = 14

Front

What does it mean to isolate a variable in an equation?

Back

Isolating a variable means to get the variable alone on one side of the equation, making it easier to solve for its value.

Front

Write and solve the equation: A book costs $15 and you have $5. How much more do you need?

Back

x + 5 = 15 ; x = 10

Front

Solve the equation: 20 = y + 5

Back

y = 15

Front

What is the first step to solve the equation x + 9 = 38?

Back

Subtract 9 from both sides to isolate x.

Front

Write and solve the equation: You have some marbles. You gave away 8 and now have 12 left. How many marbles did you start with?

Back

m - 8 = 12 ; m = 20

Front

Solve the equation: 3.5 = z + 1.2

Back

z = 2.3