Without delay, let's solve this. We've got 588 and we will be multiplying it by 15, that is, adding 588 to itself 15 times.
Step 1: 0 + 588 = 588
Step 2: 588 + 588 = 1176
Step 3: 1176 + 588 = 1764
Step 4: 1764 + 588 = 2352
Step 5: 2352 + 588 = 2940
Step 6: 2940 + 588 = 3528
Step 7: 3528 + 588 = 4116
Step 8: 4116 + 588 = 4704
Step 9: 4704 + 588 = 5292
Step 10: 5292 + 588 = 5880
Step 11: 5880 + 588 = 6468
Step 12: 6468 + 588 = 7056
Step 13: 7056 + 588 = 7644
Step 14: 7644 + 588 = 8232
Step 15: 8232 + 588 = 8820

So, 588*15 = 8820