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.
You can also round a number. 1. Enter the value 2.175 into cell A1. 2. On the Home tab, in the Number group, click the Decrease Decimal button two times. Notice the button next to it to show more decimal places. Note: If you look at the formula bar, you can see that cell A1 still contains the value 2.175. 3.