9 Mystery Pictures with 27 Color By Number Math Worksheets. Each worksheet includes 10 unique math problems. All pictures have a colored answer key. Directions: Solve the math problem, look at the color next to it, and then color in ALL of the squares that have that answer. Table Of Contents: 1) Calculate the Sale Price of an Item on Sale. Example: Original Price: $100 Discount: 20% Sale Price: ? (9 Math Coloring Worksheets) 2) Calculate the Percentage Discount. Example: Original Price: $100