For example, what do your credit card number, your car’s VIN code, and a UPC code on a can of beans have in common? The answer is that they all are long strings of digits which are notoriously ...

Place value is really important when building up numbers. The order the digits are written in a number determine its value. A number can be made of more than one digit. We use place value headings ...

In August, 2010, [Alexander Yee] and [Shigeru Kondo] won a respectable amount of praise for calculating pi to more digits than anyone else. They’re back again, this time doubling the number of ...

The basic method for adding numbers with 4 digits or more is to use column addition. Watch this video to remind yourself about how to use column addition to add up numbers with 3 digits.