CREST Mental Maths Olympiad Class 12 Previous Year Papers

Q.1

In the adjoining figure, find the value of semi perimeter for ∆ABD and ∆BCD .

Q.2

Leo buys a coloured TV for $10,000 and sells it for $12,000. Find his gain %.

Q.3

In 250 consecutive days, weather forecasts were correct 175 times. Find the probability of getting 'not correct' forecast.

Q.4

In a bag there are 5 white, 6 black and 3 green cards. One card is drawn at random. What is the probability of having a card which is not green?

Q.5

Division of 133 by 19 gives remainder = 0. What is the H.C.F. (133, 9)?

Q.6

A began a business with $4500 and was joined afterwards by B with $3000. When did B join if the profits at the end of the year were divided in the ratio 2 : 1?

Q.7

What is the quadratic equations whose roots are 3 and 4?

Q.8

Observe the graph below and answer the question.
What is the average of Diesel prices over the years 2020–2022?

Q.9

Simplify:

17/29 x 8/102 x 48/27 x 3/2 = ?

Q.10

$600 are invested at 5% simple interest p.a. In how much time will it double itself ?