Cody tried to multiply 30 x 40 by decomposing 30 and 40 into multiples of 10. His work is below 30 x 40 =(3 x 10)x (4x 10) Step 1 = (3 x 4) x (10 x 10) Step 2 = 12 x 100 Step 3 1,200 Step 4 Find Cody's mistake.​