Without delay, let's solve this. We've got 75 and we will be multiplying it by 12, that is, adding 75 to itself 12 times.
Step 1: 0 + 75 = 75
Step 2: 75 + 75 = 150
Step 3: 150 + 75 = 225
Step 4: 225 + 75 = 300
Step 5: 300 + 75 = 375
Step 6: 375 + 75 = 450
Step 7: 450 + 75 = 525
Step 8: 525 + 75 = 600
Step 9: 600 + 75 = 675
Step 10: 675 + 75 = 750
Step 11: 750 + 75 = 825
Step 12: 825 + 75 = 900

So, 75*12 = 900