In this engaging interactive whiteboard activity students will practice finding the constant of proportionality in proportional relationships. This activity specifically addresses CCSS.7.RP.A.2.B by having students identify the constant of proportionality (unit rate) in tables, graphs and written descriptions of situations. Each student fills their bingo card with 16 numbers from a set of 36 numbers that correspond with randomly selected proportional reasoning problems. Bingo card and answer