IXL | Multi-step word problems: identify reasonable answers

Mr. Khan works 5 days a week for about 10 hours a day. He does this for 48 weeks a year.

Based on that, Mr. Khan estimates that he works around 2,500 hours a year. Is that a good estimate?

Yes.

No, it is much too high.

No, it is much too low.

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Learn with an example

question

Sam is building a table and 4 chairs. He will use 18 nails to build each chair and 42 nails to build the table. He estimates that he will need roughly 180 nails. Does that sound about right?

Yes.

No, it is much too high.

No, it is much too low.

solution

To check the estimate, find about how many nails Sam will need. Use numbers that are easy to work with and that are close to the numbers in the problem.

Sam builds 4 chairs with 18 nails each. That is 4 chairs with about 20 nails each. Multiply to estimate the total number of nails for the chairs.

Sam also builds a table with 42 nails. That is about 40 nails.

Finally, add the total number of nails for the chairs and the number of nails for the table.

120

Sam will need roughly 120 nails. An estimate of 180 is much too high.

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