28 Math Mystery Pictures to review the 4 operations and fractions for Back to School, Fall, Halloween and Thanksgiving. This product is aligned to the Common Core standards. Each Mystery Picture has 9 different worksheets to allow you to differentiate: two sheets of mixed additions and subtractions with equations (EASY and HARD), two sheets of multiplications (EASY and HARD), two sheets of mixed multiplications and divisions with equations (EASY and HARD), two sheets of mixed 4 oper