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

The veterinarian recommends that Hakim's dog, Pickles, exercise for a certain amount of time each day. Today, Hakim and Pickles jogged on a forest trail for 18 minutes. Pickles still needs to exercise for 7 more minutes to reach the daily goal.

Let

represent how many minutes Pickles should exercise each day. Which equation models the problem?

–

Solve this equation to find how many minutes Pickles should exercise each day.

minutes

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Learn with an example

question

Brittany decided to donate her birthday money to two causes that were important to her. She donated some money to a disaster relief fund. Then she donated $48.60 to help plant trees. Brittany's total donations added up to $80.00.

Let

represent how much money Brittany donated to the disaster relief fund. Which equation models the problem?

–

48.60

80.00

48.60

80.00

Solve this equation to find how much money Brittany donated to the disaster relief fund.

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:

Brittany donated
d
dollars to the disaster relief fund.
Brittany donated $48.60 to help plant trees.
Brittany's total donations added up to $80.00.

This equation models the problem.

d	+	48.60	=	80.00

money donated to the disaster relief fund		money donated to help plant trees		total amount donated

Use inverse operations to solve for

Since this equation shows adding

48.60,

you should subtract 48.60 from both sides to solve.

48.60

80.00

48.60

–

48.60

80.00

–

48.60

31.40

Brittany donated $31.40 to the disaster relief fund.

Looking for more? Try these:

Lesson: Solving equations

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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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