This color-by-code worksheet bundle set contains 330 worksheets (10 animals, 33 worksheets and 1 answer key in each animals) in different levels for the following skills: matching numbers to 20, number words, addition to 20, subtraction within 20, doubles addition, doubles + 1 addition, multiplication from 1 to 12 and division from 1 to 12. The set is suitable for any of your students from preschool to grade 3. 1. Color Answer Key2. Number Match 0 to 103. Number Match 11 to 204. Number Words