OK, let's crack this. We're given 51 and our task is to multiply it by 6. Essentially, we'll be adding 51 to itself 6 times.
Step 1: 0 + 51 = 51
Step 2: 51 + 51 = 102
Step 3: 102 + 51 = 153
Step 4: 153 + 51 = 204
Step 5: 204 + 51 = 255
Step 6: 255 + 51 = 306

So, 51*6 = 306