Exponents And Powers Worksheets - Class 8, National Council Of Educational Research And Training Page 2
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36M A T H E M A T I C S
(B)
(B)
(B)
(B)
(B)
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Examples
Examples
Examples
Examples
Examples
In example 1 and 2, there are four options given out of which one is
correct. Write the correct answer.
Example 1 : Multiplicative inverse of 2
7
is
(a) 2
–7
(b) 7
2
(c) – 2
7
(d) – 2
7
Solution
: The Correct answer is (a).
Example 2 : The human body has about 100 billion cells. This number
can be written in exponential form as
–11
11
9
–9
(a) 10
(b) 10
(c) 10
(d) 10
Solution
: The correct answer is (b).
In examples 3 to 5, fill in the blanks to make the statements true.
4
⎛ ⎞
5
×
=
4
(– 4)
______
⎜ ⎟
Example 3 :
⎝ ⎠
4
4
Solution
: 5
( ) ( )
2
3
×
=
–3
–2
2
3
_____
Example 4 :
–6
Solution
: 6
Example 5 : The distance between earth and sun is 150 million
kilometres which can be written in exponential form as
_______.
Solution
: 1.5 × 10
8
km
In examples 6 and 7, state whether the statements are true (T) or false (F):
Example 6 : Very small numbers can be expressed in standard form
using positive exponents.
Solution
: False.
Example 7 : (–10) × (–10) × (–10) × (–10) = 10
–4
Solution
: False.
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