Multiply to 100: Arrays & Area Models 3-107
Use snap cubes or unit squares to model 2-digit numbers concretely in an array. What's 5x15? Break 15 into 10 and 5. Apply the distributive property to find and add partial products to get the total product. 5x15 = (5x10) + (5x5) = 50+25 = 75. When ready, transition from arrays to area models without unit squares.
