64 + 64 = 128
-10, 10
a) 48 or any multiple of 48 - b) 2 or 4
prime numbers / numbers with only 2 factors - 1 and themselves
6 x 15 = 90
7, 11, 23
0.8, 0.73
-0.1
-0.1
220
27, 64
-8
a) 5 squared, 5x5, 25 - b) 7
a) 2, 5, 23 or 2, 11, 17 - b) 2 because even+odd+odd=even and 2 is the only even prime number
a) 13, 23 - b) 33, 63
2
