IXL | Multi-step word problems: identify reasonable answers

Matt multiplies 9 x 11 x 11 on the board.

He works out that it equals 1,089. Does that sound about right?

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question

The Wilsons are storing water in case there is a natural disaster. They have 12 small bottles of water that hold 8 ounces each. They also have 4 large bottles of water that hold 24 ounces each. They estimate that they have around 2,000 ounces of water in total. Is that a good estimate?

Yes.

No, it is much too high.

No, it is much too low.

solution

To check the estimate, find about how many ounces of water the Wilsons have. Use numbers that are easy to work with and that are close to the numbers in the problem.

The Wilsons have 12 small bottles of water that hold 8 ounces each. That is about 10 bottles with 10 ounces each. Multiply to estimate the total amount from the small bottles.

100

The Wilsons also have 4 large bottles of water that hold 24 ounces each. That is 4 bottles with about 25 ounces each. Multiply to estimate the total amount from the large bottles.

100

Finally, estimate the total amount of water. Add the amount from the small bottles and the amount from the large bottles.

100

200

The Wilsons have around 200 ounces of water in total. An estimate of 2,000 is much too high.

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Teacher tools

Work it out

Not feeling ready yet? These can help:

E.3Estimate to solve word problems

I.11Multi-step word problems with positive rational numbers

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