Looking for a way to engage students, encourage "math talk," and formatively assess all at the same time? This formative assessment sorting card activity is a great way to do all of these things! This file focuses on multiplication of two 2-digit numbers, 3-digit by 1-digit, and 4-digit by 1-digit numbers. Base ten models, area models, and partial product cards are included. Built in differentiation with non one to one matching and blank cards for students to show what they know. Pre and post assessment also included! Students love working in groups with these cards to show what they know!