These function box worksheets require students to look at the numbers in each function box. Where there are numbers on each side, they should determine what the first number was multiplied by OR divided by to get the second number. Students may need to apply that rule to all other numbers in the function box. They can also need to determine the pattern for the numbers in the In boxes. There are 6 function boxes, each with either 5 or 6 open spaces to be filled in. There is an answer key.