Sure thing, let's get straight to it. We start with 10 and we're going to multiply it by 4, which means adding 10 to itself 4 times.
Step 1: 0 + 10 = 10
Step 2: 10 + 10 = 20
Step 3: 20 + 10 = 30
Step 4: 30 + 10 = 40

So, 10*4 = 40