Alright, let's solve this math problem step by step. First, we have the number 999. Next, we see the multiplication sign, which means we need to multiply something. And what are we multiplying it by? We multiply it by 125. So, we're going to take the number 999 and add it to itself 125 times.
Step 1: 0 + 999 = 999
Step 2: 999 + 999 = 1998
Step 3: 1998 + 999 = 2997
Step 4: 2997 + 999 = 3996
Step 5: 3996 + 999 = 4995
Step 6: 4995 + 999 = 5994
Step 7: 5994 + 999 = 6993
Step 8: 6993 + 999 = 7992
Step 9: 7992 + 999 = 8991
Step 10: 8991 + 999 = 9990
Step 11: 9990 + 999 = 10989
Step 12: 10989 + 999 = 11988
Step 13: 11988 + 999 = 12987
Step 14: 12987 + 999 = 13986
Step 15: 13986 + 999 = 14985
Step 16: 14985 + 999 = 15984
Step 17: 15984 + 999 = 16983
Step 18: 16983 + 999 = 17982
Step 19: 17982 + 999 = 18981
Step 20: 18981 + 999 = 19980
Step 21: 19980 + 999 = 20979
Step 22: 20979 + 999 = 21978
Step 23: 21978 + 999 = 22977
Step 24: 22977 + 999 = 23976
Step 25: 23976 + 999 = 24975
Step 26: 24975 + 999 = 25974
Step 27: 25974 + 999 = 26973
Step 28: 26973 + 999 = 27972
Step 29: 27972 + 999 = 28971
Step 30: 28971 + 999 = 29970
Step 31: 29970 + 999 = 30969
Step 32: 30969 + 999 = 31968
Step 33: 31968 + 999 = 32967
Step 34: 32967 + 999 = 33966
Step 35: 33966 + 999 = 34965
Step 36: 34965 + 999 = 35964
Step 37: 35964 + 999 = 36963
Step 38: 36963 + 999 = 37962
Step 39: 37962 + 999 = 38961
Step 40: 38961 + 999 = 39960
Step 41: 39960 + 999 = 40959
Step 42: 40959 + 999 = 41958
Step 43: 41958 + 999 = 42957
Step 44: 42957 + 999 = 43956
Step 45: 43956 + 999 = 44955
Step 46: 44955 + 999 = 45954
Step 47: 45954 + 999 = 46953
Step 48: 46953 + 999 = 47952
Step 49: 47952 + 999 = 48951
Step 50: 48951 + 999 = 49950
Step 51: 49950 + 999 = 50949
Step 52: 50949 + 999 = 51948
Step 53: 51948 + 999 = 52947
Step 54: 52947 + 999 = 53946
Step 55: 53946 + 999 = 54945
Step 56: 54945 + 999 = 55944
Step 57: 55944 + 999 = 56943
Step 58: 56943 + 999 = 57942
Step 59: 57942 + 999 = 58941
Step 60: 58941 + 999 = 59940
Step 61: 59940 + 999 = 60939
Step 62: 60939 + 999 = 61938
Step 63: 61938 + 999 = 62937
Step 64: 62937 + 999 = 63936
Step 65: 63936 + 999 = 64935
Step 66: 64935 + 999 = 65934
Step 67: 65934 + 999 = 66933
Step 68: 66933 + 999 = 67932
Step 69: 67932 + 999 = 68931
Step 70: 68931 + 999 = 69930
Step 71: 69930 + 999 = 70929
Step 72: 70929 + 999 = 71928
Step 73: 71928 + 999 = 72927
Step 74: 72927 + 999 = 73926
Step 75: 73926 + 999 = 74925
Step 76: 74925 + 999 = 75924
Step 77: 75924 + 999 = 76923
Step 78: 76923 + 999 = 77922
Step 79: 77922 + 999 = 78921
Step 80: 78921 + 999 = 79920
Step 81: 79920 + 999 = 80919
Step 82: 80919 + 999 = 81918
Step 83: 81918 + 999 = 82917
Step 84: 82917 + 999 = 83916
Step 85: 83916 + 999 = 84915
Step 86: 84915 + 999 = 85914
Step 87: 85914 + 999 = 86913
Step 88: 86913 + 999 = 87912
Step 89: 87912 + 999 = 88911
Step 90: 88911 + 999 = 89910
Step 91: 89910 + 999 = 90909
Step 92: 90909 + 999 = 91908
Step 93: 91908 + 999 = 92907
Step 94: 92907 + 999 = 93906
Step 95: 93906 + 999 = 94905
Step 96: 94905 + 999 = 95904
Step 97: 95904 + 999 = 96903
Step 98: 96903 + 999 = 97902
Step 99: 97902 + 999 = 98901
Step 100: 98901 + 999 = 99900
Step 101: 99900 + 999 = 100899
Step 102: 100899 + 999 = 101898
Step 103: 101898 + 999 = 102897
Step 104: 102897 + 999 = 103896
Step 105: 103896 + 999 = 104895
Step 106: 104895 + 999 = 105894
Step 107: 105894 + 999 = 106893
Step 108: 106893 + 999 = 107892
Step 109: 107892 + 999 = 108891
Step 110: 108891 + 999 = 109890
Step 111: 109890 + 999 = 110889
Step 112: 110889 + 999 = 111888
Step 113: 111888 + 999 = 112887
Step 114: 112887 + 999 = 113886
Step 115: 113886 + 999 = 114885
Step 116: 114885 + 999 = 115884
Step 117: 115884 + 999 = 116883
Step 118: 116883 + 999 = 117882
Step 119: 117882 + 999 = 118881
Step 120: 118881 + 999 = 119880
Step 121: 119880 + 999 = 120879
Step 122: 120879 + 999 = 121878
Step 123: 121878 + 999 = 122877
Step 124: 122877 + 999 = 123876
Step 125: 123876 + 999 = 124875

So, 999*125 = 124875