Exponents And Powers Worksheets - Class 8, National Council Of Educational Research And Training Page 16
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36M A T H E M A T I C S
(e) Express 56 km in m.
(f)
Express 5 tons in g.
(g) Express 2 years in seconds.
2
2
(h) Express 5 hectares in cm
(1 hectare = 10000 m
)
x −
3
–6
2
1
⎛ ⎞
⎛ ⎞
⎛ ⎞
2
2
2
×
=
⎜ ⎟
⎜ ⎟
⎜ ⎟
116. Find x so that
⎝ ⎠
⎝ ⎠
⎝ ⎠
9
9
9
−
3
−
⎛
⎞
3
⎜
⎟
117. By what number should
be divided so that the quotient may
⎝
⎠
2
−
2
⎛
⎞
4
⎜
⎟
be
?
⎝
⎠
27
In questions 118 and 119, find the value of n.
n
6
=
3
6
118.
–2
6
×
n
6
2
2
=
18
2
119.
–3
2
×
–3
125
x
120.
–3
×
×
–6
5
25
x
×
×
2
16 10
64
121.
×
4
2
2
4
×
×
m
3
–2
5
5
5
=
12
5
122. If
, find m.
–5
5
123. A new born bear weighs 4 kg. How many kilograms might a five year
old bear weigh if its weight increases by the power of 2 in 5 years?
124. The cells of a bacteria double in every 30 minutes. A scientist begins
with a single cell. How many cells will be there after
(a) 12 hours
(b) 24 hours
6
125. Planet A is at a distance of 9.35 × 10
km from Earth and planet B is
7
6.27 × 10
km from Earth. Which planet is nearer to Earth?
126. The cells of a bacteria double itself every hour. How many cells will
there be after 8 hours, if initially we start with 1 cell. Express the
answer in powers.
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E E E E E
P P P P P
XEMPLAR
XEMPLAR
XEMPLAR
XEMPLAR
XEMPLAR
ROBLEMS
ROBLEMS
ROBLEMS
ROBLEMS
ROBLEMS
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