CREST Mental Maths Olympiad Class 9 Previous Year Papers

Q.1

Write the decimal expansion of the following number which have terminating decimal expansion:

8/5

Q.2

Solve:
2 × 256 × ? = 82 × 102 × 2

Q.3

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

Q.4

What is the coefficient of x² in the polynomial P(x) = 3x³ + 10(x – x²) – 5x² – 2?

Q.5

A single discount, equivalent to a successive discount of 40% and 30% is:

Q.6

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.7

Factorise:
(x² - x)² - 8(x² - x) + 12

Q.8

If x and y are the two digits of the number 883xy such that this number is divisible by 80, then  x + y = ?

Q.9

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.10

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