This winter color by code activity is super fun and engaging for your students to practice addition and subtraction skills within 20. This set includes 20 hidden pictures that require your students to practice color by number and solve the addition and subtraction problems to complete them. The problems need to be solved to reach the sum of 20, such as 10+10, 12+4, 13+5, and subtraction from teens down, such as 19-2, 16-2, 20-5. The winter-themed pictures engage students in coloring activities a