Sure thing! We've got 129 and we're gonna multiply it by 6. That's the same as adding 129 to itself 6 times.
Step 1: 0 + 129 = 129
Step 2: 129 + 129 = 258
Step 3: 258 + 129 = 387
Step 4: 387 + 129 = 516
Step 5: 516 + 129 = 645
Step 6: 645 + 129 = 774

So, 129*6 = 774