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- Use of Exponents to Express Small Numbers in Standard Form

In this page we have *Important questions for exponents Class 8 maths Chapter 12 CBSE*
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Evaluate

- 2
^{ -2} - (- 2)
^{ - 2} - (3/2)
^{-5 }

As we know that

b

(i) 2

(ii) (-2)

(iii) (3/2)

Simplify and express the result in power notation with positive exponent.

(i) (-2)

(ii) (1/2)

(iii) (-5)

(i) (-2)

= (-2)

= (-2)

=-2

(ii) (1/2)

= (1/4) X (4/25)

= 1/25

iii) (-5)

=25 × (3/5) =15

Find the value of.

- (4
^{0}+ 4^{ - 1}) × 2^{2} - (3
^{ - 1}× 9^{ - 1}) ÷ 3^{ - 2} - (11
^{ - 1}+ 12^{ - 1}+ 13^{ - 1})^{0}

- (4
^{0}+ 4^{ - 1}) × 2^{2}= (1+1/4) × 4

= 4+1=5

- (3
^{ - 1}× 9^{ - 1}) ÷ 3^{ - 2}= [(1/3) × (1/9)] ÷ (1/9)

=1/3

=1 as a

Find the value of x here

(11/9)

(11/9)

(11/9)

-3=2x-1

Or

x=-1

Find the value of

2

2

2

So m+4=10

m=6

Express the following numbers in standard form.

(i) 0.0000000015 (ii) 0.00000001425

(iii) 102000000000000000

- 0.0000000015
=1.5 ×10
^{-9}

- 0.00000001425

=1.425×10^{-8}

=1.02×10

Express the following numbers in usual form.

(i) 34.02 x 10

(iii) 9 x 10

- 34.02 x 10
^{-5}= .0003402

=950000

3. 9 x 10

=.0009

4. 2.0001 x 10

=200010000

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Class 8 Maths Class 8 Science