Question

use the model to find 9 × 428. first, find the area of each rectangle. then, find the total area. 9 × 428 =

Explanation:

Step1: Find area of first rectangle

$9\times400 = 3600$

Step2: Find area of second rectangle

$9\times20=180$

Step3: Find area of third part (8 is left from 428 - 400 - 20)

$9\times8 = 72$

Step4: Calculate total area

$3600+180 + 72=3852$

Answer:

3852