A complex Excel 2007 workbook could require multiple sheets. By default, Microsoft provides three sheets on each workbook, but you can add as many as you need. Clicking the "Insert Worksheet" button ...

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.

Addition is finding the total of two or more numbers. You use the addition sign (+) when you want to add one number to another. Addition calculations also use the equals sign (=). The left side and ...