This activity is great for helping students practice the various ways of writing numbers (standard form, expanded form, word form, and representation using base 10 blocks).This activity can be used during guided math rotations. small group remediation/extension or as a center. The color coordinated cards make it easy to differentiate based on student readiness. It's simple! Print out each group of cards, laminate and cut out. You'll be able to use this activity year after year!