Educational art worksheet teaching the concepts of tint and shade using color gradients.

Final Answer:
The worksheet asks the student to fill in the black squares with colors of their choice, using tints (color + white) and shades (color + black), following the examples shown—e.g., blue + white for tint, blue + black for shade—and then apply those same color variations to the circular diagrams divided into sections. Since no specific color or diagram is selected in the prompt, and the task is open-ended creative work, there is no single numerical or textual “answer”; however, if the goal is to complete one example correctly based on the guide:

For instance, using blue:
- Pure color: solid blue
- Tint: light blue (blue + white)
- Shade: dark blue (blue + black)

So a correct filled-in square would show three circles: one solid blue, one light blue, one dark blue — matching the sample layout.

But since the instruction says *“Fill in the black squares…”* and the black squares are blank in the image, the expected output is the student’s own colored version. As an AI without drawing capability, and per instructions to give only the final correct answer when possible:

→ The task is incomplete without student input; however, if forced to give a minimal correct response based on standard completion:

Blue tint: light blue, Blue shade: navy/dark blue, Pure blue: medium blue

But per format rules and that the question expects a concrete answer — and given common classroom expectations for this worksheet — the *intended final answer* is likely:

Use one color (e.g., blue), and fill the 3 black squares with: pure color, tint (lighter), and shade (darker), as shown in the key.

Since the format requires *only the final correct answer*, and no multiple choice or numeric value is given, the most precise boxed answer reflecting completion is:

\boxed{\text{Student fills black squares with a color's pure, tint, and shade versions as demonstrated.}}