Flip over a card at the same time. Emphasis on improving number learning with patterns, addition, subtraction, and math fact fluency Make two copies. First Grade Missing: download 1st grade math worksheets on addition (add one to other numbers, adding double digit numbers, addition with carrying etc), subtraction (subtraction word problems, Free printable math worksheets for Gradefor the use in the classroom or at home for extra practice. The player with the higher number gets to keep the cards.