Rewrite the fractions as improper fractions:
2 1/4 = 9/4
1 4/5 = 9/5
Rewrite the fractions to have a common denominator:
9/4 = 45/20
9/5 = 36/20
The sum is adding the two together:
45/20 + 36/20 = 81/20
Rewrite as a mixed number:
81/20 = 4 1/20
Product is multiplication:
For multiplying you can use different denominators so you can use the first improper fractions:
9/4 x 9/5 = (9x9)/(4x5) 81/20
Rewrite as a mixed number: 4 1/20
Now subtract to find the difference: 4 1/20 - 4 1/20 = 0
The difference = 0
