Review additions and subtractions while having fun with this original Grace Hopper mystery picture. A great activity for Women's History Month or the International Day of Women and Girls in Science.This product is aligned to the Common Core standards.Contains 6 different worksheets allowing you to differentiate: two sheets of additions (EASY and HARD), two sheets of subtractions (EASY and HARD) and two sheets of mixed additions and subtractions with equations (EASY and HARD).In the HARD ones, no