18
15
15 ÷ 18 = 0.8333
0.0083
-18
0.0556
18
15
39-15+18 6x3 Answer: 25
5.8333
0.2778
No. All three are not prime numbers. A prime number is a number that is only divisible by itself and 1. 15 can be divided by 1, 3, 5 and 15 16 can be divided by 1, 2, 4, 8 and 16 18 can be divided by 1, 2, 3, 6, 9 and 18.