Write the mixed numbers into improper fraction.

The improper fraction of           ()

The improper fraction of

To add fractions the denominators must be equal.

Find the least common denominator (LCD).

Multiples of 7: 7, 14, 21, 28, 35, 42, 49, 56, 63.....

Multiples of 9: 9, 18, 27, 36, 45, 54, 63, 72, 81.....

The least common multiple of 7 and 9 is 63.

Rewrite each fraction with a common denominator of 63.

Rewrite fractions using the LCD 63.

                          (Add:  )

The value of the expression is .