Mental maths - GL - grade 6

Each side of a regular hexagon is 3 cm. What is its perimeter?

• 9 cm

• 12 cm

• 18 cm

• 24 cm

The radius of a circle is 7 cm. What is its diameter?

• 3.5 cm

• 7 cm

• 14 cm

• 21 cm

Which of these angles is obtuse?

• 45°

• 75°

• 110°

Convert 0.25 into a fraction.

• 1/4

• 1/3

• 2/5

• 3/8

Which shape is a trapezium?

• A shape with one pair of parallel sides

• A shape with all sides equal

• A shape with two pairs of parallel sides

• A shape with all right angles

The length of a rectangle is 8 cm, and the width is 5 cm. What is its area?

• 13 cm²

• 30 cm²

• 40 cm²

• 80 cm²

Which of the following numbers are all prime numbers?

• 2, 3, 5, 9

• 3, 7, 11, 13

• 4, 5, 7, 8

• 9, 13, 17, 21

Convert 9/4 into a mixed number.

• 2 1/4

• 2 3/4

• 3 1/4

• 3 3/4

A 20% tax is added to £540. What is the total cost?

• £648

• £600

• £108

• £432

In a bag of 30 sweets, the ratio of green sweets to other sweets is 1:4. How many green sweets are there?

• 5

• 6

• 8

• 10