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Question

Dora got to know that there are eighty six thousand four hundred seconds in a day. Help her in writing this number in standard form.

A
86,400
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B
864,000
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C
8,640
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D
864
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Solution

The correct option is A 86,400
The given data is 86,400.

It contains 5 digits.

Hence, the left most digit should be placed at ten thousands place.

Then, 6 should be placed at thousands place.

4 should be placed at hundreds place.

The remaining zeros should be placed at tens and ones places.

Hence, the correct answer is 86,400.

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