Soluzione - Long subtraction

Because the upper digit (2) in the ones column is too small to get a positive difference, borrow 1 from the digit (2) in the next number place which becomes (1) and get (12).

Subtract the numbers in the ones column from the top number:
12-4=8

Because the upper digit (1) in the tens column is too small to get a positive difference, borrow 1 from the digit (6) in the next number place which becomes (5) and get (11).

Subtract the numbers in the tens column from the top number:
11-2=9

Because the upper digit (5) in the hundreds column is too small to get a positive difference, borrow 1 from the digit (2) in the next number place which becomes (1) and get (15).

Subtract the numbers in the hundreds column from the top number:
15-6=9

Because the upper digit (1) in the thousands column is too small to get a positive difference, borrow 1 from the digit (2) in the next number place which becomes (1) and get (11).

Subtract the numbers in the thousands column from the top number:
11-5=6

Write 1 in the ten thousands place.

Write 2 in the hundred thousands place.

Write 6 in the millions place.

Write 2 in the ten millions place.

The solution is: 26,216,998