This is a multi-disciplinary lesson, covering 5th grade math and writing standards. Students will use modern pricing data to calculate how much it would cost to purchase the items listed in the song, "The Twelve Days of Christmas." Students will multiply up to 4 digit decimals and whole numbers by 1 and 2 digit whole numbers. They will also add 12 numbers, with and without decimals, as well as divide by a single digit divisor. Also included are opinion writing prompts, as well an extension activity allowing them to create their own Twelve Days of Christmas, researching the pricing and adding the totals.