Covert expanded to standard forms to thousands quiz. This is an interactive test online to teach kids on how to convert a number that has been expanded to reveal its place values into its standard form. For example, 2000 + 500 + 60 + 8 = 2568; there are similar activities in this quiz. It is a gap-fill exercise; type in your answer and check instantly if it is correct or incorrect. Place value quiz for 2nd, 3rd, 4th, 5th grade kids online.