Sure thing, let's get straight to it. We start with 20 and we're going to multiply it by 5, which means adding 20 to itself 5 times.
Step 1: 0 + 20 = 20
Step 2: 20 + 20 = 40
Step 3: 40 + 20 = 60
Step 4: 60 + 20 = 80
Step 5: 80 + 20 = 100

So, 20*5 = 100