CREST Mental Maths Olympiad Class 9 Previous Year Papers

Q.1

The graph below shows the profit earned by three companies over the years (in $10 million )
What was the average profit earned by all three companies in the year 2021?

Q.2

From the top of a 5 m high building, the angle of elevation of the top of a cable tower is 60° and the angle of depression of its foot is 45°. Determine the height of the tower.

Q.3

The mean of 11 observations is 50. If the mean of first Six observations is 49 and that of last six observations is 52, then find sixth observation.

Q.4

In a pack of 52 cards, what is the probability of getting a face card?

Q.5

Find the next number in the sequence:
1, 1, 2, 3, 5, 8, 13, ?

Q.6

Find curved and total surface area of a conical flask of radius 6 cm and height 8 cm.

Q.7

In a school, the average age of students is 6 years, and the average age of 12 teachers is 40 years. If the average age of the combined group of all the teachers and students is 7 years, then the number of students is:

Q.8

In a ∆PQR, PS = SR = SQ and ∠PRS = 55°. Find ∠SQP.

Q.9

Factorise:
(x² - x)² - 8(x² - x) + 12

Q.10

A man travelled a certain distance by train at a rate of 15 km/h and walked back at the rate of 12 km/h. The whole journey took 9 hours. Find the distance he travelled.