Let's roll up our sleeves and solve this. We have 68 and we're going to multiply it by 6, essentially adding 68 to itself 6 times.
Step 1: 0 + 68 = 68
Step 2: 68 + 68 = 136
Step 3: 136 + 68 = 204
Step 4: 204 + 68 = 272
Step 5: 272 + 68 = 340
Step 6: 340 + 68 = 408

So, 68*6 = 408