1,000,000,000
1000000000
One billion is 10x10x10x10x10x10x10x10x10. It is a 1 followed by nine zeros. It is one thousand millions
The answer to (10 \times 10 \times 10 \times 10 \times 10 \times 10 \times 10 \times 10 \times 10) is (10^9), which equals 1,000,000,000.
The power to which a 'base number' (usually 10) has to be raised to produce a given number. as an example: Log (base 10) of 100 = 2 ............ because 10 raised to the power of 2 (or 10 squared) or 10 x 10 = 100 log (base 10) of 1000 = 3 ........... because 10 raised to the power of 3 (or 10 cubed) or 10 x 10 x10 = 1000 log (base 10) of 1000000000 = 9 ... because 10 raised to the powr of 9 or 10x10x10x10x10x10x10x10x10 = 1000000000 In a similar way log (base 2) of 16 = 4................. because 2x2x2x2 (2 raised to the power of 4) = 16 and so on.