Monsters Theme Math Coloring Pages (Color by Code) with Answer Box. This pack contains 18 Coloring Worksheets (3 sets of 6 coloring sheets). You can give a different version for each student. All pictures have a colored answer key. Directions: Solve the math problem. Match the answer to a letter from the answer box. Color the picture by the letter. This is a fun and engaging way to learn! Finding a percent of a number. Difficulty Level: Easy. Percents: Percents: 1%, 10%, 20%, 25%, 30%, 40%