Without delay, let's solve this. We've got 989 and we will be multiplying it by 15, that is, adding 989 to itself 15 times.
Step 1: 0 + 989 = 989
Step 2: 989 + 989 = 1978
Step 3: 1978 + 989 = 2967
Step 4: 2967 + 989 = 3956
Step 5: 3956 + 989 = 4945
Step 6: 4945 + 989 = 5934
Step 7: 5934 + 989 = 6923
Step 8: 6923 + 989 = 7912
Step 9: 7912 + 989 = 8901
Step 10: 8901 + 989 = 9890
Step 11: 9890 + 989 = 10879
Step 12: 10879 + 989 = 11868
Step 13: 11868 + 989 = 12857
Step 14: 12857 + 989 = 13846
Step 15: 13846 + 989 = 14835

So, 989*15 = 14835