Let's roll up our sleeves and solve this. We have 321 and we're going to multiply it by 6, essentially adding 321 to itself 6 times.
Step 1: 0 + 321 = 321
Step 2: 321 + 321 = 642
Step 3: 642 + 321 = 963
Step 4: 963 + 321 = 1284
Step 5: 1284 + 321 = 1605
Step 6: 1605 + 321 = 1926

So, 321*6 = 1926