Let's roll up our sleeves and solve this. We have 650 and we're going to multiply it by 15, essentially adding 650 to itself 15 times.
Step 1: 0 + 650 = 650
Step 2: 650 + 650 = 1300
Step 3: 1300 + 650 = 1950
Step 4: 1950 + 650 = 2600
Step 5: 2600 + 650 = 3250
Step 6: 3250 + 650 = 3900
Step 7: 3900 + 650 = 4550
Step 8: 4550 + 650 = 5200
Step 9: 5200 + 650 = 5850
Step 10: 5850 + 650 = 6500
Step 11: 6500 + 650 = 7150
Step 12: 7150 + 650 = 7800
Step 13: 7800 + 650 = 8450
Step 14: 8450 + 650 = 9100
Step 15: 9100 + 650 = 9750

So, 650*15 = 9750