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

The sixth-grade students at Rutherford Middle School took a field trip to a science museum. As part of the trip, the students got to see a short movie called Tornadoes: Destruction by Mother

Nature.

Some of the students saw the morning showing of the movie, and 45 of the students saw the afternoon showing. There were 87 students on the field trip in all.

Let

represent how many students saw the morning showing. Which equation models the problem?

–

Solve this equation to find how many students saw the morning showing.

students

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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.

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Lesson: Solving equations

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