Sure thing, let's get straight to it. We start with 500 and we're going to multiply it by 15, which means adding 500 to itself 15 times.
Step 1: 0 + 500 = 500
Step 2: 500 + 500 = 1000
Step 3: 1000 + 500 = 1500
Step 4: 1500 + 500 = 2000
Step 5: 2000 + 500 = 2500
Step 6: 2500 + 500 = 3000
Step 7: 3000 + 500 = 3500
Step 8: 3500 + 500 = 4000
Step 9: 4000 + 500 = 4500
Step 10: 4500 + 500 = 5000
Step 11: 5000 + 500 = 5500
Step 12: 5500 + 500 = 6000
Step 13: 6000 + 500 = 6500
Step 14: 6500 + 500 = 7000
Step 15: 7000 + 500 = 7500

So, 500*15 = 7500