The American Optometric Association suggests that children should have their first regular eye exam at six months of age. Another vision exam should take place when a child is around two or three years of age when their vision undergoes its most rapid development and vision correction is most effective.
The ISNUMBER function is a quick, easy way to check if a cell contains a number. Our example used the IF function to illustrate how ISNUMBER can be used. If you haven't used IF in a formula before, you can read our lesson on the IF function here.
Excel has a problem trying to sort alphanumeric cells in cells by the number portion only. The reason is simply because Excels Sort feature evaluates each cell value by reading left to right. However, we can over-come this in a few ways with the aid of Excel Macros. Fixed Length Text.