OK, let's work through this together. We're starting with 603 and we're going to multiply it by 14, which means we add 603 to itself 14 times.
Step 1: 0 + 603 = 603
Step 2: 603 + 603 = 1206
Step 3: 1206 + 603 = 1809
Step 4: 1809 + 603 = 2412
Step 5: 2412 + 603 = 3015
Step 6: 3015 + 603 = 3618
Step 7: 3618 + 603 = 4221
Step 8: 4221 + 603 = 4824
Step 9: 4824 + 603 = 5427
Step 10: 5427 + 603 = 6030
Step 11: 6030 + 603 = 6633
Step 12: 6633 + 603 = 7236
Step 13: 7236 + 603 = 7839
Step 14: 7839 + 603 = 8442

So, 603*14 = 8442