Mathematics Q on fractions...?

[NicolaGrace]

A boy has 80 pence pocket money. He spends 1/4 on sweets. How much does he have left?

How do you go about working this one out?

AND

If 24 out of 64 people wear glasses what fraction do not wear glasses?Please show me your workings out...

[liaba]

I think the first one is
80-1/4=79.75
i do not know about the second one.

[Jun Agruda]

Money he's got - a fractional part he spend = what was left

80 pence - 1/4(80) pence = what was left
80 pence - 20 pence = what was left
60 pence = what was left

Fraction that do not wear glasses:
= no. of who does not wear/total people
= (64 - 24)/64
= 40/64
= 5/8

Answer: 5/8 do not wear glasses.

[como]

Question 1
spends 20 p
remainder = 60 p

Question 2
40 people do not wear glasses
40/64 = 10/16 = 5/8

[laurent A]

Fraction wat a nightmare, best advise:
1stQ:
80*1/4, that give you wat1/4 is in 80p, then substract wat the result is goin to be outta 80p to find out wat's remaining.
2ndQ:
that is easy: see it as 24/64, check the similarities that those two numbers have:
24= 8*3
64=8*8
so that gives 3 and 8 which in fractions wud translated as 3/8
Takes that to tackle the other question you have, do as many as you could then u won't find them hard to tackle.....

[Derke N]

80 pence times 1/4 means 80 times 1 then divided by 4.
Which is 20. So that is what he spends.
He has left what he had minus what he spends so 80 - 20 = 60

If 24 out of 64 do not wear glasses so 64 -24 = 40 do wear glasses.

40 divided by 64 is the fraction

=40/64 but 8 is a common factor of 64 and 40 so dividing the top and bottom by 8 gives

= 5/8

[Puzzling]

PROBLEM 1:

80 / 4 = 20
He spent 20 pence.

80 - 20 = 60
He has 60 pence left.

PROBLEM 2:

24 of the people do.
64 - 24 = 40
40 people do not.

The fraction would be:
40/64

But you can reduce this by dividing by 8:
5/8

Answer:
5/8 of the people do not where glasses.

The other way you could do this is to turn the first number into a fraction (24/64 = 3/8) then subtract from 1. 1 - 3/8 = 8/8 - 3/8 = 5/8. Either way you get the same answer.