Ks3 Mathematics 10-4-10 Level 5 Answer Booklet Page 20
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31MENTAL QUESTIONS
DAY 7
1
How many millimetres are there in nine
centimetres?
1cm = 10mm so 9cm = 90mm
2
A lesson starts at nine-fifty and finishes
at ten-fifteen.
How long is the lesson in minutes?
9.50 10.00 is 10mins
10.00 10.15 is 15mins
10 + 15 = 25mins
3
I buy a book costing one pound forty-
five.
What charge should I get from a five
pound note?
£1.45 is 5p less than £1.50
£5.00 - £1.50 = £3.50
so £3.55
4
Add together sixty-five and fifty-eight.
65 + 58 60 + 50 = 110
123
5 + 8
+ 13
5
One magazine costs one pound ninety-
five pence.
What will be the cost of five of these
magazines?
£1.95 x 5.
£2 x 5 = £10
5p x 5 = 25p
so £10 – 25p = £9.75
20
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