Without delay, let's solve this. We've got 958 and we will be multiplying it by 20, that is, adding 958 to itself 20 times.
Step 1: 0 + 958 = 958
Step 2: 958 + 958 = 1916
Step 3: 1916 + 958 = 2874
Step 4: 2874 + 958 = 3832
Step 5: 3832 + 958 = 4790
Step 6: 4790 + 958 = 5748
Step 7: 5748 + 958 = 6706
Step 8: 6706 + 958 = 7664
Step 9: 7664 + 958 = 8622
Step 10: 8622 + 958 = 9580
Step 11: 9580 + 958 = 10538
Step 12: 10538 + 958 = 11496
Step 13: 11496 + 958 = 12454
Step 14: 12454 + 958 = 13412
Step 15: 13412 + 958 = 14370
Step 16: 14370 + 958 = 15328
Step 17: 15328 + 958 = 16286
Step 18: 16286 + 958 = 17244
Step 19: 17244 + 958 = 18202
Step 20: 18202 + 958 = 19160

So, 958*20 = 19160