1024.
Use a calculator if you can't figure it out!
There are several pairs of numbers that, when multiplied together, give you 16. For example, 4 and 4, as well as 2 and 8, both multiply to 16. Additionally, -4 and -4 or -2 and -8 also yield 16 when multiplied. Thus, the pairs (4, 4) and (2, 8) are two possible answers.
1 and 16 2 and 8 4 and 4
The three numbers that can be multiplied to get 16 are 2, 2, and 4. This is because 2 multiplied by 2 equals 4, and then 4 multiplied by 4 equals 16. In this case, the prime factorization of 16 is 2 x 2 x 2 x 2, which simplifies to 2^4.
To double 4 four times, you would continuously multiply by 2. Start with 4, then multiply by 2 to get 8, then 16, then 32, and finally 64.
16 and 8. 2 and 64. 4 and 32.
These are the pairs of numbers that when multiplied are equal to 64: (1, 64) (2, 32) (4, 16) (8, 8)
16
16 2*8=16
16 16
1 x 16, 2 x 8, 4 x 4
8*8 2*32 4*16
1 x 32, 2 x 16, 4 x 8, 8 x 4, 16 x 2, 32 x 1