Level 7- Mental Maths

Question 1

What number is five cubed?

Answer 1

125

Question 2

A circle has radius r.

What is the formula for the area of the circle?

Answer 2

(pi)r²

Question 3

What is one third of three-quarters of one hundred?

Answer 3

1/3 of 75 = 25

Question 4

I’m thinking of a number. I call it n.
I square my number and then add 4.
Write an expression to show the result.

Answer 4

n2 + 4

Question 5

What is three point nine divided by two?

Answer 5

0.45/ 1.95

Question 6

What is half of two-thirds?

Answer 6

1/3

Question 7

A fair spinner has eight equal sections with a number on each

section. Five of them are even numbers. Three are odd
numbers. What is the probability that I spin an even number?

Answer 7

5/8

Question 8

What is the remainder when you divide three hundred by

twenty-nine?

Answer 8

10 is remainder

Question 9

There are fourteen girls and thirteen boys in a class. What is
the probability that a pupil chosen at random will be a girl?

Answer 9

14/27

girls/ total

Question 10

The first even number is two. What is the hundredth even

number?

Answer 10

2 x 100 = 200

Question 11

The mean of two numbers is 8. One of the numbers is two.

What is the other number?

Answer 11

Total must be 8 x 2 = 16

? + 2 = 16 …so… ? = 14

Question 12

How many edges are there on a square based pyramid?

Answer 12

4 on base
4 on sides
= 8

Question 13

Multiply 8.7 by 2

Answer 13

17.4

Question 14

The first odd number is 1. What is the hundredth odd

number?

Answer 14

199

Question 15

Add four to minus five.

Answer 15

-5 + 4 = -1

Question 16

How many nought point fives are there in ten?

Answer 16

20

Question 17

On average, the driest place on earth gets only nought point five
millimetres of rain every year. In total, how much rain would it
expect to get in twenty years?

Answer 17

0

Question 18

What is the sum of the angles in a rhombus?

Answer 18

All 4-sided shapes (quadrilaterals) have inside angles which sum
to 360º

Question 19

It takes some-one one and half minutes to swim the length of

the pool. How many lengths can I swim in 15 minutes?

Answer 19

10 lengths

Question 20

Multiply minus eight by minus three

Answer 20

-8 x -3 = 24

Question 21

I have a fair eight sided dice numbered 12 to 19. What is

the probability that I will throw a prime number?

Answer 21

P(prime number) =
3
/8