Winter Math Activities Color by Number: Penguin, Snowman, Polar Bear, Owl Practice number matching, adding, subtracting, multiplying or dividing with these fun Winter theme color-by-code pictures! This activity is perfect for math centers, morning work, early finishers, substitutes or homework. Each picture has 33 worksheets 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 an