CREST Mental Maths Olympiad Class 12 Previous Year Papers

Q.1

What will come in place of question mark (?) in the following equation? (approx.)
1599 × 199 ÷ 49 – 1398 + 3877 = ?

Q.2

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

Q.3

Find the radius of the largest right circular cone that can be cut out of a cube whose edge is 9 cm.

Q.4

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

Q.5

Find the value of x + y.

Q.6

Convert the recurring decimals to fractions:

Q.7

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

Q.8

Ten years ago, father was 4 times as old as his son. After 10 years, the father will be twice as old as his son. What is the present age of son?

Q.9

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

Q.10

Simplify:

x² − 13x − 42 = (x − 6) (x − 7)