This 13 task activity introduces matrices including writing 3 equations with 3 variables from a word problem, creating a matrix from 3 equations, creating equations from a matrix, writing equations from a matrix in reduced row echelon form, identifying order of a matrix, matrix elements and adding, subtracting and multiplying matrices by a scaler. This activity requires no previous knowledge of matrices or matrix operations. This activity is modeled from Building Thinking Classrooms by Peter L