When you add a 1-digit number to a 3-digit number, the same rules apply as when you are adding a 1-digit number to a 1 or 2-digit number. Number lines, partitioning, Base 10 and the column method ...

When multiplying a 2-digit number by a 1-digit number you can use both mental and written methods. Let's take a look at an example of solving a multiplication problem in your head. Before you ...