One-Step Addition Equations

Solve one-step addition equations

A one-step addition equation is an equation where a number is added to a variable, and you need to find the value of the variable. The goal is to keep the equation balanced while isolating the variable.

Method

1. Identify the added number. Look for the number being added to the variable.
2. Use the inverse operation. Subtract that number from both sides of the equation.
3. Simplify. Carry out the subtraction and write the value of the variable.
4. Check your answer. Substitute your value back into the original equation to see whether both sides match.

Example idea

If an equation looks like x + 5 = 12, subtract 5 from both sides to get x = 7.

Helpful check

After solving, plug the answer into the original equation. If the left side and right side are equal, your solution is correct. If not, review the subtraction step and make sure you used the same operation on both sides.