Answer
$4000-86=3914$
Work Step by Step
Working left to right, subtract the corresponding digits in each place value. If necessary borrow 10 from the next higher place value position to avoid a negative result.
$4000$
$\ \underline{-86}$
Borrow from the tens postion and subtract $10-6=4$
The subtrahend in the tens position is now 9. Subtract $9-8=1$
The subtrahend in the hundreds position is now 9. Subtract $9-0=9$
The subtrahend in the thousands position is now . Subtract $3-0=3$
Write the result of each subtraction in its proper position for its place value.