How do you write 1.09 in expanded form?

To write 1.09 in expanded form, you would break it down into its individual place values. In this case, 1 is in the ones place, 0 is in the tenths place, and 9 is in the hundredths place. So, 1.09 in expanded form would be written as 1 + 0.0 + 0.09.