Divide by 2-Digit Divisors using an Area Model 5-25
Use area models to find an unknown factor. What's 450÷18? Think of 450 as the area of a rectangle with side length 18. What's the other side? Break 450 into 360 and 90 – easier multiples of 18. 360÷18 = 20, 90÷18 = 5, and 20+5 = 25. Add partial side lengths to get the total side length – the unknown factor.
