Number playtime! First, change each word form and expanded form into standard form. Then, look at the circled digit in each number and write its place and value. After that, solve the two math problems and explain how they check each other.

This activity sheet has three challenges that will help you improve your number sense. One, become proficient in recognizing the three forms: standard, word, and expanded. Two, zoom in to a digit: name its place and name its value. Three, solve and explain why the two math problems check each other. Enjoy the challenges!