If you can subtract two 3-digit numbers from each other, then you can use the same method to subtract two 4-digit numbers. You use the same method, no matter how many digits are in the numbers.

For third graders learning Common Core math in Georgia, there are four ways to subtract—and only four ways allowed.

Find out about the column method to subtract more than 4-digit numbers with this Year 5 article from BBC Bitesize.

In fourth grade, students focus most on using all four operations - addition, subtraction, multiplication, and division - to solve multi-step word problems involving multi-digit numbers. Fourth ...