Completing the whole with fractions:
a) and 
make 1 whole.
b) 1 whole is made up of 
and
Completing the whole with fractions:
a) and make 1 whole.
b) 1 whole is made up of and
7 - 4 = 3, so 
and make 1 whole.
9 - 2 = 7. So 1 whole is made up of and 