Let's get this math done. We have 810 and we're going to multiply it by 6. This is the same as taking 810 and adding it to itself 6 times.
Step 1: 0 + 810 = 810
Step 2: 810 + 810 = 1620
Step 3: 1620 + 810 = 2430
Step 4: 2430 + 810 = 3240
Step 5: 3240 + 810 = 4050
Step 6: 4050 + 810 = 4860

So, 810*6 = 4860