Let's get this math done. We have 996 and we're going to multiply it by 40. This is the same as taking 996 and adding it to itself 40 times.
Step 1: 0 + 996 = 996
Step 2: 996 + 996 = 1992
Step 3: 1992 + 996 = 2988
Step 4: 2988 + 996 = 3984
Step 5: 3984 + 996 = 4980
Step 6: 4980 + 996 = 5976
Step 7: 5976 + 996 = 6972
Step 8: 6972 + 996 = 7968
Step 9: 7968 + 996 = 8964
Step 10: 8964 + 996 = 9960
Step 11: 9960 + 996 = 10956
Step 12: 10956 + 996 = 11952
Step 13: 11952 + 996 = 12948
Step 14: 12948 + 996 = 13944
Step 15: 13944 + 996 = 14940
Step 16: 14940 + 996 = 15936
Step 17: 15936 + 996 = 16932
Step 18: 16932 + 996 = 17928
Step 19: 17928 + 996 = 18924
Step 20: 18924 + 996 = 19920
Step 21: 19920 + 996 = 20916
Step 22: 20916 + 996 = 21912
Step 23: 21912 + 996 = 22908
Step 24: 22908 + 996 = 23904
Step 25: 23904 + 996 = 24900
Step 26: 24900 + 996 = 25896
Step 27: 25896 + 996 = 26892
Step 28: 26892 + 996 = 27888
Step 29: 27888 + 996 = 28884
Step 30: 28884 + 996 = 29880
Step 31: 29880 + 996 = 30876
Step 32: 30876 + 996 = 31872
Step 33: 31872 + 996 = 32868
Step 34: 32868 + 996 = 33864
Step 35: 33864 + 996 = 34860
Step 36: 34860 + 996 = 35856
Step 37: 35856 + 996 = 36852
Step 38: 36852 + 996 = 37848
Step 39: 37848 + 996 = 38844
Step 40: 38844 + 996 = 39840

So, 996*40 = 39840