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Express the following numbers in standard form.

- 0.0000000000085
- 0.00000000000942
- 6020000000000000
- 0.00000000837
- 31860000000

- 0.0000000000085
=8.5 ×10
^{-12}

- 0.00000000000942
=9.42×10
^{-12}

- 6020000000000000
=6.02×10
^{15}

- 0.00000000837
=8.37 ×10
^{-9}

- 31860000000
=3.186×10
^{10}

Express the following numbers in usual form.

- 3.02 x 10
^{-6} - 4.5 x 10
^{4} - 3 x 10
^{-8} - 1.0001 x 10
^{9} - 5.8 x 10
^{12} - 3.61492 x 10
^{6}

- 3.02 x 10
^{-6}= .00000302

- 4.5 x 10
^{4}=45000

- 3 x 10
^{-8}=.00000003

- 1.0001 x 10
^{9}=1000100000

- 5.8 x 10
^{12}=5800000000000

=3614920

Express the number appearing in the following statements in standard form.

(i) 1 micron is equal to 1/1000000 m.

(ii) Charge of an electron is 0.000, 000, 000, 000, 000, 000, 16 coulomb.

(iii) Size of bacteria is 0.0000005 m

(iv) Size of a plant cell is 0.00001275 m

(v) Thickness of a thick paper is 0.07 mm

- 1/1000000

=1.6 ×10

3. 0.0000005

=5 ×10

4. 0.00001275

=1.275 ×10

5. 0.07

=7×10

In a stack there are 5 books each of thickness 20 mm and 5 paper sheets each of thickness 0.016 mm. What is the total thickness of the stack?

Total thickness

=5×20 + 5X.016

=100 + 5× 1.6 ×10

=100 + .08

=100.08 mm

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