At the end of this lesson, students should be able to subtract by borrowing or trading.
From this example what we do is called borrowing. We cannot subtract or take away 8 from 3 => 3 – 8, so we borrow a 10 from the tens column. We then add this ten to the 3 units giving us 13.
We then go ahead and subtract 8 from 13 => 13 – 8 = 5