Let's roll up our sleeves and solve this. We have 708 and we're going to multiply it by 18, essentially adding 708 to itself 18 times.
Step 1: 0 + 708 = 708
Step 2: 708 + 708 = 1416
Step 3: 1416 + 708 = 2124
Step 4: 2124 + 708 = 2832
Step 5: 2832 + 708 = 3540
Step 6: 3540 + 708 = 4248
Step 7: 4248 + 708 = 4956
Step 8: 4956 + 708 = 5664
Step 9: 5664 + 708 = 6372
Step 10: 6372 + 708 = 7080
Step 11: 7080 + 708 = 7788
Step 12: 7788 + 708 = 8496
Step 13: 8496 + 708 = 9204
Step 14: 9204 + 708 = 9912
Step 15: 9912 + 708 = 10620
Step 16: 10620 + 708 = 11328
Step 17: 11328 + 708 = 12036
Step 18: 12036 + 708 = 12744

So, 708*18 = 12744