Color the shark by solving the math problems and matching the answers to the correct colors.

To solve this "Color by Number" puzzle, we need to do the math for each section of the picture and then match the answer to the color key at the top.

The Color Key:
* 12 = Green
* 15 = Yellow
* 18 = Pink
* 6 = Red
* 9 = Blue
* 10 = Gray

Here is the step-by-step solution for every section in the image:

Top Row (Left to Right):
1. `15 - 3` = 12 → Green
2. `16 + 2` = 18 → Pink
3. `2 + 10` = 12 → Green
4. `19 - 1` = 18 → Pink
5. `16 - 4` = 12 → Green
6. `8 + 10` = 18 → Pink
7. `20 - 8` = 12 → Green

Second Row Down:
8. `14 + 1` = 15 → Yellow
9. `20 - 5` = 15 → Yellow
10. `6 + 9` = 15 → Yellow
11. `16 - 1` = 15 → Yellow
12. `7 + 8` = 15 → Yellow

Middle Section (Body and Fins):
13. `1 + 5` = 6 → Red (Tail tip)
14. `16 - 10` = 6 → Red (Top fin)
15. `6 + 9` = 15 → Yellow (Top middle body)
16. `5 + 1` = 6 → Red (Right fin tip)
17. `7 - 1` = 6 → Red (Bottom tail tip)
18. `1 + 8` = 9 → Blue (Tail base)
19. `10 - 1` = 9 → Blue (Middle body spot)
20. `20 - 11` = 9 → Blue (Main body area)
21. `18 - 9` = 9 → Blue (Back body area)
22. `8 + 1` = 9 → Blue (Eye)
23. `20 - 10` = 10 → Gray (Mouth/Teeth area)

Bottom Section:
24. `12 + 1` = 13 → *(Note: 13 is not in the key. However, looking at the pattern, this is likely a typo for `12+3=15` or similar. But strictly following the math: 13 has no color. Let's re-read carefully. Ah, `12-1`? No, it says `12+1`. Let's look at neighbors. `9+1=10` is gray. `3+5=8`? No key for 8. Let's re-calculate all bottom ones carefully.)*

Let's re-evaluate the bottom row calculations specifically:
* `3 + 5` = 8 → *(No color key for 8. This might be a mistake in the worksheet design, or perhaps I should look closer. Wait, `3+5` is definitely 8. Is there an 8? No. Let's look at `18-6`. That is 12. Green. `20-2` is 18. Pink. `3+9` is 12. Green. `10-8` is 2. No key. `8+4` is 12. Green. `2+16` is 18. Pink.)*

*Correction on Bottom Row Logic:*
It seems some numbers in the bottom row result in answers not listed in the key (like 8, 13, 2). However, most standard worksheets like this usually have valid keys. Let's double check the visible keys: 12, 15, 18, 6, 9, 10.
Let's re-calculate the bottom sections that *do* fit:
* `18 - 6` = 12 → Green
* `20 - 2` = 18 → Pink
* `3 + 9` = 12 → Green
* `8 + 4` = 12 → Green
* `2 + 16` = 18 → Pink

The sections with `3+5` (8), `12+1` (13), `10-8` (2), and `9+1` (10) are tricky.
* `9 + 1` = 10 → Gray (This fits!)
* `10 - 8` = 2 → (No key)
* `12 + 1` = 13 → (No key)
* `3 + 5` = 8 → (No key)

*Self-Correction*: Often in these puzzles, if a number isn't in the key, it might be white/uncolored, or there is a typo in the problem source. However, for the purpose of helping the student, I will provide the colors for all the calculations that match the key provided.

Summary of Colors by Calculation Result:

* Answer 6 (Red): `1+5`, `16-10`, `5+1`, `7-1`
* Answer 9 (Blue): `1+8`, `10-1`, `20-11`, `18-9`, `8+1`
* Answer 10 (Gray): `20-10`, `9+1`
* Answer 12 (Green): `15-3`, `2+10`, `16-4`, `20-8`, `18-6`, `3+9`, `8+4`
* Answer 15 (Yellow): `14+1`, `20-5`, `6+9`, `16-1`, `7+8`
* Answer 18 (Pink): `16+2`, `19-1`, `8+10`, `20-2`, `2+16`

*(Note: The sections `12+1`, `3+5`, and `10-8` result in 13, 8, and 2 respectively, which are not in the color key. You may leave these blank or check with your teacher if there is a missing color code.)*

Final Answer:
Red (6): Tail tips, top fin, right fin tip.
Blue (9): Eye, main body spots, tail base.
Gray (10): Mouth area, lower jaw spot.
Green (12): Top border stripes, lower body stripes.
Yellow (15): Upper back, dorsal fin area.
Pink (18): Top border stripes, lower belly/tail end.