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4. In order to choose the best teaching technique for making the class learning more effective,
a survey was conducted in all sections of Class 8. Total number of students are 360. There are
3 types of grades awarded to the students:
Grade A: for students above average Case study

Grade B: for students who are average
Grade C: for students who are below the average.
1 of the total students are rewarded with Grade A, 3 of the total students are rewarded with
6 4
Grade B, and the rest are rewarded with Grade C.
(a) Find the number of students who rewarded with Grade A.

(b) Find the number of students who rewarded with Grade C.
(c) How many more students are rewarded with Grade B than with Grade C?

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MAths connect
The Indian Space Research Organisation (ISRO) launched a satellite
3
into an orbit at an altitude of of Earth’s radius. If the Earth’s radius
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is approximately 6371 km, what is the satellite’s orbital altitude?

Life Skills
It is believed that architecture containing the golden ratio in its design looks beautiful.
a ab
+
The two numbers a and b are said to be golden ratio = = , where a is the longer length and b is
b a
the shorter length. The Taj Mahal’s design uses a golden ratio of approximately 1.618. If the height of the
dome (a) is 80 feet, find the length of the base of the dome (b).

Mental Maths

1. Who am I? The sum of my numerator and denominator is a prime number and I am equivalent to rational
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number .
80
2. What will be the product of additive inverse and the reciprocal of a non-zero rational number?
−4 6
3. Which one will be closer to 0 on a number line, or ?
5 9
 −5  5
4. What should be added to  +  to get the result 1?
 9  6

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