Add 3-digit and 2-digit numbers Learn how to add 3-digit and 2-digit numbers using the column method. How to use column subtraction Find out how number columns allow you to take large numbers and ...

Column subtraction ... you cannot subtract 3 tens from 2 tens. Once you have exchanged, you now have 12 tens take away 3 tens. 12 − 3 = 9 If you can subtract two 4-digit numbers from each ...