A milli- is a prefix meaning a thousandth so 0.001
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$0.01
.25
1 and 18 hundredths = 1.18 in decimal
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.
Expressed as a decimal, 1 2/10 is equal to 1.2.