Level 7- Mental Maths Flashcards
What number is five cubed?
125
A circle has radius r.
What is the formula for the area of the circle?
(pi)r²
What is one third of three-quarters of one hundred?
1/3 of 75 = 25
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.
n2 + 4
What is three point nine divided by two?
0.45/ 1.95
What is half of two-thirds?
1/3
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?
5/8
What is the remainder when you divide three hundred by
twenty-nine?
10 is remainder
There are fourteen girls and thirteen boys in a class. What is
the probability that a pupil chosen at random will be a girl?
14/27
girls/ total
The first even number is two. What is the hundredth even
number?
2 x 100 = 200
The mean of two numbers is 8. One of the numbers is two.
What is the other number?
Total must be 8 x 2 = 16
? + 2 = 16 …so… ? = 14
How many edges are there on a square based pyramid?
4 on base
4 on sides
= 8
Multiply 8.7 by 2
17.4
The first odd number is 1. What is the hundredth odd
number?
199
Add four to minus five.
-5 + 4 = -1
How many nought point fives are there in ten?
20
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?
0
What is the sum of the angles in a rhombus?
All 4-sided shapes (quadrilaterals) have inside angles which sum
to 360º
It takes some-one one and half minutes to swim the length of
the pool. How many lengths can I swim in 15 minutes?
10 lengths
Multiply minus eight by minus three
-8 x -3 = 24
I have a fair eight sided dice numbered 12 to 19. What is
the probability that I will throw a prime number?
P(prime number) =
3
/8
