Let's look at another subtraction. It's not possible to subtract ... Rename 3 as 13 and then subtract: 13 - 7 = 6 If you can subtract two 3-digit numbers from each other, then you can use the ...

Column subtraction is a good written method to ... 12 − 3 = 9 If you can subtract two 4-digit numbers from each other, then you can use the same method to subtract using larger numbers.