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

The students in Kevin's gym class have the option of playing volleyball or dodgeball. There are 29 students in his class. Of those students, 16 signed up for volleyball and the rest signed up for dodgeball.

Let

represent the number of students who signed up for dodgeball. Which equation models the problem?

–

Solve this equation to find the number of students who signed up for dodgeball.

students

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Learn with an example

question

Patty works in a greenhouse. During her shift this morning, Patty watered some hydrangeas and 47 petunias. She watered a total of 83 plants.

Let

represent how many hydrangeas Patty watered. Which equation models the problem?

–

Solve this equation to find how many hydrangeas Patty watered.

hydrangeas

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:

Patty watered
h
hydrangeas.
Patty watered 47 petunias.
Patty watered a total of 83 plants.

This equation models the problem.

h	+	47	=	83

number of hydrangeas		number of petunias		total number of plants

Use inverse operations to solve for

Since this equation shows adding

47,

you should subtract 47 from both sides to solve.

–

Patty watered 36 hydrangeas this morning.

Looking for more? Try these:

Lesson: Solving equations

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Teacher tools

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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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