OK, let's crack this. We're given 393 and our task is to multiply it by 7. Essentially, we'll be adding 393 to itself 7 times.
Step 1: 0 + 393 = 393
Step 2: 393 + 393 = 786
Step 3: 786 + 393 = 1179
Step 4: 1179 + 393 = 1572
Step 5: 1572 + 393 = 1965
Step 6: 1965 + 393 = 2358
Step 7: 2358 + 393 = 2751

So, 393*7 = 2751