To find a fraction of an amount you divide by the denominator and times by the numerator (divide by the bottom times by the top)
£1 divided by 10 is 10 pence
10 pence times 1 is 10 pence
£1 divided by 10 is 10 pence
10 pence times 3 is 30 pence
50 pence divided by 5 is 10 pence
10 pence times 1 is 10 pence
£1 divided by 2 is 50 pence
50 pence timed 1 is 50 pence