OK, let's crack this. We're given 989 and our task is to multiply it by 50. Essentially, we'll be adding 989 to itself 50 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
Step 16: 14835 + 989 = 15824
Step 17: 15824 + 989 = 16813
Step 18: 16813 + 989 = 17802
Step 19: 17802 + 989 = 18791
Step 20: 18791 + 989 = 19780
Step 21: 19780 + 989 = 20769
Step 22: 20769 + 989 = 21758
Step 23: 21758 + 989 = 22747
Step 24: 22747 + 989 = 23736
Step 25: 23736 + 989 = 24725
Step 26: 24725 + 989 = 25714
Step 27: 25714 + 989 = 26703
Step 28: 26703 + 989 = 27692
Step 29: 27692 + 989 = 28681
Step 30: 28681 + 989 = 29670
Step 31: 29670 + 989 = 30659
Step 32: 30659 + 989 = 31648
Step 33: 31648 + 989 = 32637
Step 34: 32637 + 989 = 33626
Step 35: 33626 + 989 = 34615
Step 36: 34615 + 989 = 35604
Step 37: 35604 + 989 = 36593
Step 38: 36593 + 989 = 37582
Step 39: 37582 + 989 = 38571
Step 40: 38571 + 989 = 39560
Step 41: 39560 + 989 = 40549
Step 42: 40549 + 989 = 41538
Step 43: 41538 + 989 = 42527
Step 44: 42527 + 989 = 43516
Step 45: 43516 + 989 = 44505
Step 46: 44505 + 989 = 45494
Step 47: 45494 + 989 = 46483
Step 48: 46483 + 989 = 47472
Step 49: 47472 + 989 = 48461
Step 50: 48461 + 989 = 49450

So, 989*50 = 49450