Let's get this math done. We have 210 and we're going to multiply it by 6. This is the same as taking 210 and adding it to itself 6 times.
Step 1: 0 + 210 = 210
Step 2: 210 + 210 = 420
Step 3: 420 + 210 = 630
Step 4: 630 + 210 = 840
Step 5: 840 + 210 = 1050
Step 6: 1050 + 210 = 1260

So, 210*6 = 1260