Annika Riz, Math Whiz (Franklin School Friends, 2)

Annika Riz loves math more than anything. She's trying to teach her dog, Prime, to count. She's determined to beat fellow math whiz Simon Ellis in a Sudoku contest at the public library. She even sleeps under number-patterned sheets.  But Annika's best friends Kelsey and Izzy think math is boring. All they care about is the upcoming school carnival: their principal is going to be dunked in a dunking tank and their class is going to have a booth selling home-baked cookies. But then disaster foils the friends' cookie-baking plans. Can math save the day?