Practice number matching, adding, subtracting, multiplying or dividing with these fun Monsters color-by-code pictures that turn into a 3D paper toys! This activity is perfect for math centers, morning work, early finishers, substitutes or homework. This product includes 4 monster pictures and each picture has 37 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 and