Maths Challenge (Hardest Maths problem)

Which of the following statements is true ?

• Natural numbers are closed under multiplication

• Whole numbers are not closed under multiplication

• Integers are not closed under multiplication

• Rational numbers are not closed under multiplication.

How many rational numbers are there between any two given rational numbers?

• Only one

• Only two

• Countless

• Nothing can be said.

The root of the equation 2x + 3 = 2(x – 4) is

• 2

• 4

• 0

• does not exist

x is an odd number. The largest odd number preceding x is

• x – 1

• x – 2

• x – 3

• x – 4.

The root of the equation 5x – 8 = 7 is

• 1

• 2

• 3

• -3

How many diagonals does a regular hexagon have ?

• 2

• 0

• 4

• 9

The measures of two angles of a quadrilateral are 110° and 100″. The remaining two angles are equal. The measure of each of the remaining two angles is

• 30°

• 60°

• 75°

• 45°

What will be the number of zeros in the square of the number 50 ?

• 1

• 2

• 3

• 4

Which of the following is not a Pythagorean triplet ?

• 3, 4, 5

• 6, 8, 10

• 5, 12, 13

• 2, 3, 4.

The smallest number by which 32 should be multiplied so as to get a perfect square is

• 2

• 3

• 4

• 8