The expression is .

Place value chart for 53 and 17.

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

First find the difference of the ones digit.

Notice that it is not possible to subtract 3 ones from 7 ones.

So, 1 unit must be borrowed from tens column.

The difference of the ones digit =.

Next find the difference of the tens digit.

The difference of the tens digit = .

The difference is 36.