#### Answer

20,080 - 13,496 = 6,584

#### Work Step by Step

20,080 - 13,496 = 6,584
Subtract the ones column. Since 0 is less than 6 you must borrow from the tens column. Compute 10 - 6 = 4. Write 4 in the ones column.
Subtract the tens column, which now contains 7 because of borrowing. Since 7 is less than 9 you must borrow from the hundreds column. Since both the hundreds and thousands column contain zero you must first borrow from the ten thousands column. Compute 17 - 9 = 8. Write 8 in the tens column.
Subtract the hundreds column, which now contains 9 because of borrowing. Compute 9 - 4 = 5. Write 5 in the hundreds column.
Subtract the thousands column, which now has a value of 9 because of borrowing. Compute 9 - 3 = 6. Write 6 in the thousands column.
Subtract the ten thousands column, which now contains 1 because of borrowing. Compute 1 - 1 =0. This is the highest order digit of the result, so write nothing in the ten thousands column.