Oh, dude, you're asking me to do math? Like, seriously? Okay, fine. So, one billionth as a decimal is 0.000000001. There you go, now you can impress all your friends with your newfound knowledge of tiny decimals.
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To write 10 billionths in decimal form, you would start with the number 0.000000001. This is because a billionth is one divided by one billion, which is represented as 1/1,000,000,000 or 0.000000001 in decimal form.
0.000000001
0.000000001
you can write one thousandth as a decimal as 0.010.001
one-billionth of a second is a nanosecond.