Let's roll up our sleeves and solve this. We have 215 and we're going to multiply it by 4, essentially adding 215 to itself 4 times.
Step 1: 0 + 215 = 215
Step 2: 215 + 215 = 430
Step 3: 430 + 215 = 645
Step 4: 645 + 215 = 860

So, 215*4 = 860