Ks3 Mathematics 10-4-10 Level 5 Answer Booklet Page 23
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31MENTAL QUESTIONS
DAY 8
1
What number is five cubed?
5 cubed means
5 x 5 x 5 = 25 x 5= 125
2
Subtract nought point seven five from
six.
6 - 0.75
6 - 1 = 5, add on 0.25 5.25
3
Twenty-five per cent of a number is
seven.
What is the number?
You need to find 100%
25% = 7, 50% = 14
so 100% = 28
4
Look at the shaded triangle drawn on a
square grid.
What is the area of this triangle?
Square is 4 x 4 = 16
Triangle is ½ of this
8 square units
5
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 out of 8 are even.
Do not use words – write as a fraction
Probability (even) = 5
8
23
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