OK, let's work through this together. We're starting with 820 and we're going to multiply it by 6, which means we add 820 to itself 6 times.
Step 1: 0 + 820 = 820
Step 2: 820 + 820 = 1640
Step 3: 1640 + 820 = 2460
Step 4: 2460 + 820 = 3280
Step 5: 3280 + 820 = 4100
Step 6: 4100 + 820 = 4920

So, 820*6 = 4920