how do you say 0.00000005 in word form?

not five tenths

not five hundredths
not 5 thousandths
not 5 tenthousandths
not 5 hundredthousandths
not 5 millionths
not 5 tenmillionths
BUT
Five hundredmillionths

.....or maybe just say five times ten to the minus eight :)

Oh, that's a tiny number! In word form, you could say it as "five hundred millionths" or if you're feeling a bit dramatic, "a speck"!

To say 0.00000005 in word form, you would say "zero point zero zero zero zero zero zero zero five."

To say the number 0.00000005 in word form, we can break it down into smaller units. Here's the step-by-step process:

1. Start by understanding the value of each digit. The digit to the right of the decimal point signifies the "tenths" place. Moving towards the left, each subsequent digit represents a smaller unit. For example:
- 0: Zero
- 0.0: Zero tenths
- 0.00: Zero hundredths
- 0.000: Zero thousandths
- 0.0000: Zero ten-thousandths
- 0.00000: Zero hundred-thousandths
- 0.000000: Zero millionths
- 0.0000005: Five ten-millionths

2. Now, we can further expand the number:
- 0.00000005: Five hundred-millionths

So, in word form, 0.00000005 is "five hundred-millionths."