Level 6- Mental Maths Flashcards
(25 cards)
What number is five cubed?
125
A circle has radius r.
What is the formula for the area of the circle?
Area = pi x radius x radius
Multiply minus six by minus two.
12
What is one third of three-quarters of one hundred?
1/3 of 75 = 75 ÷ 3 = 25
I’m thinking of a number. I call it n. I square my number then add four.
Write an expression to show the result.
n2 + 4
There are seven red and three blue balls in a bag. I am going to take a
ball out of the bag at random. What is the probability that the ball will
be blue?
Total number of balls = 7 + 3 = 10
Probability (blue ball) = 7 out of 10 = 7/10 = 0.7
I am thinking of a number. I call it n.
I double my number then I subtract three. Write an
expression to show the result.
2n - 3
What percentage of fifty pounds is thirty-five pounds?
70%
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?
10 mm
What is three point nine divided by two?
1.95
What is half of two-thirds?
1/3
The population of the United Kingdom is about
fifty-nine million.
Write this number in figures.
59 000 000
What is three-fifths of forty pounds?
One fifth (£40 ÷ 5) = £8 Three fifths (£8 x 3) = £24
I am thinking of a number. I call it
n. I add five to
my number.
Write an expression to show the result.
Answer: n + 5
Five percent of a number is 8. What is the
number?
5% = 8
10% =16
100% = 160
What is the remainder when you divide three
hundred by twenty-nine?
10 x 29 = 290 Therefore remainder is 10
300 – 290
Twenty-five per cent of a number is seven.
What is the number?
25% = 7
50% = 14
Therefore 100% = 28
The first even number is two.
What is the hundredth even number?
200
The mean of two numbers is 8. One of the numbers is
two. What is the other number?
Mean = 8, Total of 2 numbers is 16 because 16 ÷ 2 = 8
If one of the numbers is 2 then the other number must be
14 (16 – 2)
Multiply 8.7 by 2
8.7 x 2 = 17.4
The first odd number is 1. What is the hundredth odd
number?
199
Add four to minus five.
-1
How many nought point fives are there in
ten?
10 ÷ 0.5 = 20
What is the sum of the angles in a
rhombus?
360°
