45 says in my math book
The range is 80 minus 20 = 60
60 -20 = 40
45+45, 20+70, 30+60, 10+80
20 + 40 = 60
25 + 30 + 40 + 45 + 60 =200 200/5 = 40
15, 30, 45, 60
Any multiple of 60 is also a multiple of 15.
The GCF is 20.
50. (Biggest # - smallest #. 65 - 15 = 50.)
The greatest common factor of the numbers 20, 40, and 60 is 20.
60 decreased by 40 is 20.
The least common multiple of 20, 40, and 60 is 120.