20 and 24 are both divisible by 2, so divide 20 by 2, which equals 10, then divide 24 by 2, which is 12, now our fraction looks like this... 10/12, 10 and 12 are both divisable by 2, so that now equals 5/6, that is the simplest form for this fraction
Weeks X months to be done is that order
