There are different methods for addition and subtraction. You may have used column ... would work here but it wouldn't be the quickest way as we only need to think about one column, the hundreds.

Here you will find a video about addition and subtraction. Watch this ... and subtracting using mental methods Learn how to supply simple mental maths with the help of mathematical companion ...

Here's how to use Excel as a calculator to perform basic arithmetic operations such as addition, subtraction ... Excel makes ...