We live in an age ruled by numbers, and as such, check digits have (ironically) innumerable uses. Books, for example, are ...

In this example we will break down the calculation ... Roll the dice four times each so that you each have a 4-digit number, such as 2396. Now that each of you has a 4-digit number, each player ...

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 ...