Let's roll up our sleeves and solve this. We have 778 and we're going to multiply it by 11, essentially adding 778 to itself 11 times.
Step 1: 0 + 778 = 778
Step 2: 778 + 778 = 1556
Step 3: 1556 + 778 = 2334
Step 4: 2334 + 778 = 3112
Step 5: 3112 + 778 = 3890
Step 6: 3890 + 778 = 4668
Step 7: 4668 + 778 = 5446
Step 8: 5446 + 778 = 6224
Step 9: 6224 + 778 = 7002
Step 10: 7002 + 778 = 7780
Step 11: 7780 + 778 = 8558

So, 778*11 = 8558