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The expression is 

First find 

Place value chart for 63 and 97.

Line up the decimal points and draw a line below the numbers.

First find the sum of the ones digit.

The sum of the ones digit =.

The sum is 10, so carry the ones digit to the next column on the left

Next find the sum of the tens digit.

The sum of the tens digit =.

The sum is 16, so carry the tens digit to the next column on the left

Next find 

21 can be written as 021

Place value chart for 160 and 021.

Line up the decimal points and draw a line below the numbers.

First find the sum of the ones digit.

The sum of the tenths digit =.

Next find the sum of the tens digit.

The sum of the tens digit =.

Next find the sum of the hundreds digit.

The sum of the hundreds digit =.

The sum is 181.