OK, let's crack this. We're given 790 and our task is to multiply it by 12. Essentially, we'll be adding 790 to itself 12 times.
Step 1: 0 + 790 = 790
Step 2: 790 + 790 = 1580
Step 3: 1580 + 790 = 2370
Step 4: 2370 + 790 = 3160
Step 5: 3160 + 790 = 3950
Step 6: 3950 + 790 = 4740
Step 7: 4740 + 790 = 5530
Step 8: 5530 + 790 = 6320
Step 9: 6320 + 790 = 7110
Step 10: 7110 + 790 = 7900
Step 11: 7900 + 790 = 8690
Step 12: 8690 + 790 = 9480

So, 790*12 = 9480