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 73. So, we're going to take the number 999 and add it to itself 73 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

So, 999*73 = 72927