Multiply 2-Digit x 2-Digit with Area Models 4-40
Transition from multiplying 1-digit and 3-digit numbers, to multiplying two, 2-digit numbers. What's 13x24? Draw a rectangle with side lengths of 13 and 24. Break both sides into their expanded form. Find and add the four partial areas to get the total area. 13x24 = (10x20)+(10x4)+(3x20)+(3x4) = 200+40+60+12 = 312.
