Estimate the product of 85 and 17 correct to the nearest ten.

1700

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1800

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1600

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1350

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Solution

The correct option is B 1800
We estimate both the numbers separately and then multiply them.
In 85, units digit is 5 so tens digit gets increased by 1 and units digit gets replaced with 0 resulting into 90.
In 17, units digit is 7 which is greater than 5 so tens digit gets increased by 1 and units digit gets replaced with 0 resulting into 20.
On multiplying 90 and 20 we get 1800.

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