A piggy bank contains 200 coins, 1/4 of these are 1p coins, 100 of these are 5p coins and the rest are 10p coins, how much is the piggy bank worth in £s?

The piggy bank contains a total of 200 coins, 1/4 of this is 50, this means the piggy bank must contain 50 1p coins, we can convert this to £s by dividing by 100, which gives us £0.01 which we can times by 50 to give us the total of 1p coins which is £0.50. Next there are 100 5p coins, we convert 5p to £s by dividing by 100 again which gives us £0.05 which we can times by 100 to get the total value of the 5p coins, this gives us £5. By this point we have counted 150 coins which means there must be 50 10p coins, we finally convert this into £s again, which gives us £0.10 which we can times by 50 to give us £5. Finally we add all of these coins together to gives us a total of £5 + £5 + £0.50 to give us £10.50. The total value of the piggy bank is £10.50