How do you write expanded form of 0.031 with fractions?

Well, honey, to write the expanded form of 0.031 with fractions, you simply break it down into its place values. So, 0.031 is equal to 0 + 0.03 + 0.001, which can be written as 0 + 3/100 + 1/1000. Easy peasy lemon squeezy!