$\"\"$

The expression is $\"\"$

Place value chart for 892.1 and 420.5.

$\"\"$

\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \

\ \	\ 8 \	\ 9 \ \ \	\ 2 \ \ \	\ 1 \ \ \	\ \	\ \
\ \	\ 4 \	\ 2 \ \ \	\ 0 \ \ \	\ 5 \ \ \	\ \	\ \

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

$\"\"$

First find the difference of the tenths digit.

The difference of the tenths digit, 1 is lesser than 5, so borrow 1 from ones place.

So 1 becomes 11. $\"\"$ .

$\"\"$

Next find the difference of the ones digit.

The difference of the ones digit, $\"\"$ .

$\"\"$

Next find the difference of the tens digit.

The difference of the tens digit, $\"\"$ .

$\"\"$

Next find the difference of the hundreds digit.

The difference of the hundreds digit, $\"\"$ .

$\"\"$

The difference of $\"\"$ is 471.6.