OK, let's work through this together. We're starting with 212 and we're going to multiply it by 4, which means we add 212 to itself 4 times.
Step 1: 0 + 212 = 212
Step 2: 212 + 212 = 424
Step 3: 424 + 212 = 636
Step 4: 636 + 212 = 848

So, 212*4 = 848