Subtracting Three Digit Numbers
How to subtract three digit numbers (for example 658  472).
 Place one number above the other so that the hundreds', tens' and ones'
places are lined up. Draw a line under the bottom number.
658
472
 Subtract the digits in the ones' place column (8  2 = 6) and place the answer
below the line in the ones' place column.
658
472
6
 Subtract the numbers in the tens' place column (5  7 = ?).
Borrow one from the hundreds' place to make the top value larger
than the bottom value. After this is done, subtract (15  7 = 8) and place the
8 below the line in the tens' place column.
5
658
472
86
 Subtract the digits in the hundreds' place column (5  4 = 1) and place the
answer below the line in the hundreds' place column
5
658
472
186

