IXL | Solve one-step addition and subtraction equations: word problems

The art club sold cupcakes to raise money for new canvases. They sold 45 red velvet cupcakes, and the rest were confetti cupcakes. The club sold 72 cupcakes in all.

Let

represent the number of confetti cupcakes the art club sold. Which equation models the problem?

–

Solve this equation to find the number of confetti cupcakes the art club sold.

confetti cupcakes

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Learn with an example

question

The gas tank in Addison's new car can hold 28 gallons of gas. She currently has 9 gallons of gas, and she wants to fill her tank before starting her road trip to the Grand Canyon.

Let

represent how many more gallons of gas it will take to fill Addison's gas tank. Which equation models the problem?

–

Solve this equation to find how many more gallons of gas it will take to fill Addison's gas tank.

gallons

key idea

If you add or subtract the same number on both sides of an equation, the two sides will still be equal.

solution

Start by listing the information given in the problem:

Addison has 9 gallons of gas.
It will take
g
more gallons of gas to fill Addison's gas tank.
Addison's gas tank holds 28 gallons of gas.

This equation models the problem.

9	+	g	=	28

gallons in the tank now		how many more gallons to fill the tank		gallons the tank holds

Use inverse operations to solve for

Since this equation shows adding

you should subtract 9 from both sides to solve.

–

It will take 19 gallons of gas to fill Addison's gas tank.

Looking for more? Try these:

Lesson: Solving equations

$Confetti$

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Teacher tools

Work it out

Not feeling ready yet? These can help:

AA.11Solve one-step addition and subtraction equations with decimals and fractions

AA.16Write a one-step equation: word problems

Lesson: Solving equations

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