9; one billionth is 1,000,000,000.
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One billionth of a metre.
One ten-billionth meter or one ten-billionth of a meter.
One billionth in standard form is 1.0 × 10-9
one trillion = 1,000,000,000,000 12 zeroes
One quadrillion = 1,000,000,000,000,000There's 15 zeroes in one quadrillion.