Sure thing, let's get straight to it. We start with 40 and we're going to multiply it by 4, which means adding 40 to itself 4 times.
Step 1: 0 + 40 = 40
Step 2: 40 + 40 = 80
Step 3: 80 + 40 = 120
Step 4: 120 + 40 = 160

So, 40*4 = 160