CREST Mental Maths Olympiad Class 9 Previous Year Papers

Q.1

The angle of elevation of the top of a tower from a point on the ground, which is 60 m away from the foot of the tower, is 30°. Find the height of the tower.

Q.2

What is the value of x, if the median of the following data is 27.5?
              24, 25, 26, x + 2, x + 3, 30, 33, 37

Q.3

Factorise:
(x² - x)² - 8(x² - x) + 12

Q.4

Angles of a linear pair are in the ratio 8 : 1. What is the degree of measure of both angles?

Q.5

How many such vowels are there in the below arrangement each of which is immediately preceded by a consonant and immediately followed by a number?

P % R 1 5 H * M T E 3 B $ V N 4 K A 8 W I 6 2 G # U H 7 J Q 11 L Y

Q.6

How many tangents are there in all in this figure?

Q.7

Solve:
2 × 256 × ? = 82 × 102 × 2

Q.8

Which of the following digit will be sixth to the left of tenth from the right end?

1 1 2 5 4 7 2 8 4 5 7 1 9 6 5 2 4 1 4 5 8 2 4 3 9 7 6 9 4 2 9

Q.9

Two pipes can fill a tank in 18 min and 24 min, respectively. Both are opened simultaneously. After how many minutes should the first pipe be closed so that the tank becomes full in 16 min?

Q.10

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