OK, let's crack this. We're given 768 and our task is to multiply it by 7. Essentially, we'll be adding 768 to itself 7 times.
Step 1: 0 + 768 = 768
Step 2: 768 + 768 = 1536
Step 3: 1536 + 768 = 2304
Step 4: 2304 + 768 = 3072
Step 5: 3072 + 768 = 3840
Step 6: 3840 + 768 = 4608
Step 7: 4608 + 768 = 5376

So, 768*7 = 5376