When rounding a number, you first have to know what [b]place value[/b] you are rounding to. After finding the correct place value, you have to [u]look at the number to the right of it[/u]. If the number to the right is between 0 and 4, keep the original place value the same number. If the number to the right is between 5 and 9, add one to the original place value.[br][br]Explore the app to see place value and rounding in action.[br][br]Click on the place value you want to round to.[br]Change the number with the button at the bottom of the applet.