Exponents And Powers Worksheets - Class 8, National Council Of Educational Research And Training Page 14
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36M A T H E M A T I C S
99. Find the value of x so that
–2
–14
8
x
⎛ ⎞
⎛ ⎞
⎛ ⎞
5
5
5
×
=
⎜ ⎟
⎜ ⎟
⎜ ⎟
(i)
⎝ ⎠
⎝ ⎠
⎝ ⎠
3
3
3
(ii) (–2)
3
× (–2)
–6
= (–2)
2x–1
(iii) (2
–1
+ 4
–1
+ 6
–1
+ 8
–1
)
x
= 1
100. Divide 293 by 10,00,000 and express the result in standard form.
÷ (100)
–3
1–4
0.
101. Find the value of x
if x = (100)
0
102. By what number should we multiply (–29)
so that the product
0
becomes (+29)
.
–1
103. By what number should (–15)
be divided so that quotient may be
–1
equal to (–15)
?
Plan Strategy :
•
Identify too much/too little information.
When you read a problem, you must decide if the problem has too much or
too little information. If the problem has too much information, you must
decide what information to use to solve the problem. If the problem has too
little information, then you should determine what additional information
you need to solve the problem.
•
Read the problems below and decide if there is too much or too little
information in each problem. If there is too much information, tell what
information you would use to solve the problem. If there is too little
information, tell what additional information you would need to solve
the problem.
•
On Monday, 20 students took
•
Aayesha is practising for a
an examination. There were
marathon. She ran for 50
10 students who scored above
minutes on Monday, 70 minutes
85 and 10 students who
on Wednesday, and 45 minutes
scored below 85. What was
on Friday. On Tuesday and
the average score?
Thursday, she lifted weights at
the gym for 45 minutes each day.
She swam for 45 minutes over
the weekend. What was the
average amount of time per day
Aayesha spent running last
week?
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