Check out these 10 Thanksgiving logic puzzles practicing addition and subtraction to 100! They're the PERFECT math enrichment worksheets for 1st and 2nd grade! November brain teasers fit easily in math centers: fast finishers use their math fact critical thinking skills to find the missing addends using addition and subtraction fact families. Put these in math stations, morning work, gifted students independent practice, early finishers, math enrichment papers, morning work, problem of the day,