Whether you're running a business or just looking to improve your BYOD situation, there's an app that can help. Can you imagine someone crazy enough to carry around two smartphones? That’s two phones ...

Addition involves finding the total of two or more numbers or amounts. There are different things you can use to help you add. You can use number lines, place value charts and place value counters.

When you estimate a number you decide approximately, or roughly, how big that number is. To estimate accurately, you need to have a good understanding of the value and order of numbers. A number line ...