Ncert solutions

Ncert solutions

Grade 8

Exponents and Powers | Exercise 12.2

Question 1

Q1) Express the following numbers in standard form.

(i) 0.0000000000085

(ii) 0.00000000000942

(iii) 6020000000000000

(iv) 0.00000000837

(v) 31860000000

Solution 1:

(i) \frac{85}{10000000000000}

=\frac{85}{10^{13}}

=85\times10^{-13}

(ii) \frac{942}{100000000000000}

=\frac{942}{10^{14}}

=942\times10^{-14}

(iii) 602\times10000000000000

=602\times10^{13}

(iv) \frac{837}{100000000000}

\frac{837}{10^{11}}

837\times10^{-11}

(v) 3186\ \times100000000000

=3186\ \times10^{11}

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subject-cta

Question 1

Q1) Express the following numbers in standard form.

(i) 0.0000000000085

(ii) 0.00000000000942

(iii) 6020000000000000

(iv) 0.00000000837

(v) 31860000000

Solution 1:

(i) \frac{85}{10000000000000}

=\frac{85}{10^{13}}

=85\times10^{-13}

(ii) \frac{942}{100000000000000}

=\frac{942}{10^{14}}

=942\times10^{-14}

(iii) 602\times10000000000000

=602\times10^{13}

(iv) \frac{837}{100000000000}

\frac{837}{10^{11}}

837\times10^{-11}

(v) 3186\ \times100000000000

=3186\ \times10^{11}

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subject-cta
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