Help the Snowmen find their missing friends! Students work to match cards, one which has a snowman with a number sentence and another that has a snowman with its' missing addend. A fun way to review Common Core Math Standards for first grade. The cards in this set focus on math facts with sums of 5, 6, 7, 8, 9, and 10. A great math center that can be done alone or with a partner. Let it Snow!