Writing formulae in words

Days of the week

If you are asked how many days there are in a week, you would find the answer easy - there are {7}. How about the number of days in two weeks? Again, the answer is fairly straightforward - there are {14}.

What happens when you are asked how many days there are in three weeks, four weeks or five weeks? If you know the formula you could work this out.

{1} week is 1 \times 7~days = 7

{2} weeks is 2 \times 7~days = 14

{3} weeks is 3 \times 7~days = 21

{4} weeks is 4 \times 7~days = 28

So, the formula to work out the number of days is:

{number~of~days}~=~number~of~weeks\times 7

Question
  1. How many pence are there in \pounds{1}?
  2. How many pence are there in \pounds{2}?
  3. How many pence are there in \pounds{7}?
  4. Write down a formula connecting the number of pence to the number of pounds?
  1. 100p = \pounds1
  2. 200p = \pounds2
  3. 700p = \pounds7
  4. pence = pounds \times 100