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.
Select cell D6 and type: =TEXT(C6,â000-00-0000â³). After hitting enter, it will show the number as 400-39-3687. To apply this formula to the rest of the numbers, drag the cell D6 down to D12 and it will automatically add the dashes to each social security number so you donât have to retype the formula.