Let's roll up our sleeves and solve this. We have 68 and we're going to multiply it by 12, essentially adding 68 to itself 12 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
Step 7: 408 + 68 = 476
Step 8: 476 + 68 = 544
Step 9: 544 + 68 = 612
Step 10: 612 + 68 = 680
Step 11: 680 + 68 = 748
Step 12: 748 + 68 = 816

So, 68*12 = 816