The answer is 8
64
8 and 8 or 4 and 16 or 2 and 32
1 & 512, 2 & 256, 4 & 128, 8 & 64, 16 & 32
192
484
The two numbers that multiply to equal 64 and add up to 12 are 8 and 8. This can be confirmed since (8 \times 8 = 64) and (8 + 8 = 12).
64
64
-8 and -8
64
8 and 8 or 4 and 16 or 2 and 32
To calculate 64 x 28, you can multiply the two numbers together: 64 x 28 = 1792.
1 & 512, 2 & 256, 4 & 128, 8 & 64, 16 & 32
192
8
484
1 x 64, 2 x 32, 4 x 16, 8 x 8.