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21:00 in military or 24-hour time is 9:00 pm
Both 21 and 9 can be divided by 3. 21/3=7 9/3=3 So 21 over 9 can be simplified to 7 over 3.
7/3, 21 /3 = 7 9 /3 = 3
The greatest common factor (GCF) for 9 and 21 is 3.
The GCF is 3. The LCM is 63.