This powerpoint contains 20 problems for students to practice and then self-check their understanding of expanded and standard form. It can be used as a whole class review or as an individual student practice. The problems will flash up for students to see. They can write their answers on paper. Then the answers will flash up for them to check their work. #1-#12 are changing from expanded form to standard form. #13 - #20 are changing from standard form to expanded form. The problems go to the thousands place.