Which of the following number is written in the standard form?

(a.) $ 21.56 \times 10^{4} $

(b.) $ 2.156 \times 10^{4} $

(c.) $ 215.6 \times 10^{4} $

(d.) None of these

Given:

There are four options given.

To do:

We have to find the number written in the standard form.

Solution:

Standard form:

Any number that we can write as a decimal number, between 1.0 and 10.0, multiplied by a power of 10, is said to be in standard form.

Among the given options, $2.156\times10^4$ is in the standard form as 2.156 is in between 1.0 and 10.0.

21.56 and 215.6 are not between 1.0 and 10.0.

Therefore,

Option B is the correct answer.

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Updated on: 10-Oct-2022

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