Mental Arithmetic Questions Worksheets - Level 6 Page 3
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21Mental Arithmetic Questions
1. What is one third of three-quarters of one hundred?
¼ of100 = 100 ÷ 4 = 25
¾ of 100 = 3 x 25 = 75
25
1
/
of 75 = 75 ÷ 3 =
3
KS3 MATHEMATICS
2.
I’m thinking of a number. I call it n. I square my number then add four.
.
Write an expression to show the result
10 4 10
Start with n to represent your number.
2
Square it …n
Level 6 Answers
2
n
+ 4
Then add 4…
Day 2
3. Twenty-one out of thirty-six pupils said they watched Top of the Pops.
What angle would show this on a pie chart?
360 ÷ 36 = 10° represents 1 person
210°
21 x 10 = 210 so the angle is
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
7
Probability (blue ball) = 7 out of 10 =
= 0.7
/
10
5. Write a multiple of three that is bigger than one hundred.
Keep adding the digits of your number until you
have a one-digit number. If it is 3, 6 or 9 then your
number is a multiple of 3
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