Solutions key for a temperature conversion worksheet, showing the formula and answers for converting 22 Celsius values to Fahrenheit.

Let’s solve this step by step.

We are converting Celsius to Fahrenheit using the formula:

F = (C × 9/5) + 32

That means:
1. Multiply the Celsius temperature by 9.
2. Divide that result by 5.
3. Add 32 to get Fahrenheit.

We’ll go row by row and calculate each one carefully.

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Row 1: 42°C
→ 42 × 9 = 378
→ 378 ÷ 5 = 75.6
→ 75.6 + 32 = 107.6°F

Row 2: 21°C
→ 21 × 9 = 189
→ 189 ÷ 5 = 37.8
→ 37.8 + 32 = 69.8°F

Row 3: 35°C
→ 35 × 9 = 315
→ 315 ÷ 5 = 63
→ 63 + 32 = 95°F

Row 4: 9°C
→ 9 × 9 = 81
→ 81 ÷ 5 = 16.2
→ 16.2 + 32 = 48.2°F

Row 5: 15°C
→ 15 × 9 = 135
→ 135 ÷ 5 = 27
→ 27 + 32 = 59°F

Row 6: 68°C
→ 68 × 9 = 612
→ 612 ÷ 5 = 122.4
→ 122.4 + 32 = 154.4°F

Row 7: 100°C
→ 100 × 9 = 900
→ 900 ÷ 5 = 180
→ 180 + 32 = 212°F

Row 8: 3°C
→ 3 × 9 = 27
→ 27 ÷ 5 = 5.4
→ 5.4 + 32 = 37.4°F

Row 9: 72°C
→ 72 × 9 = 648
→ 648 ÷ 5 = 129.6
→ 129.6 + 32 = 161.6°F

Row 10: 34°C
→ 34 × 9 = 306
→ 306 ÷ 5 = 61.2
→ 61.2 + 32 = 93.2°F

Row 11: 11°C
→ 11 × 9 = 99
→ 99 ÷ 5 = 19.8
→ 19.8 + 32 = 51.8°F

Row 12: 77°C
→ 77 × 9 = 693
→ 693 ÷ 5 = 138.6
→ 138.6 + 32 = 170.6°F

Now let’s do the right column — these are already in Fahrenheit, so we need to convert them BACK to Celsius? Wait — looking at the table again...

Actually, looking at the original worksheet structure:

Left side says “Convert °C into Fahrenheit” → so left column is Celsius, we convert to Fahrenheit.

Right side says “Convert °C into Fahrenheit” too — but the values given are like -4°C, 0°C, etc. So same thing — convert those Celsius temps to Fahrenheit.

Wait — no! Look again.

In the example on top:

“Convert 12°C into Fahrenheit” → answer is 53.6°F

And “Convert 43°C into Fahrenheit” → answer is 109.4°F

Then below, the table has two columns:

Left column: labeled with numbers 1–12, and temperatures like 42°C, 21°C... → so we convert those to °F.

Right column: also numbered 13–24, with temps like -4°C, 0°C, 5°C... → so we also convert those to °F.

So yes — all entries are Celsius, and we must convert each to Fahrenheit.

I think I misread earlier — let me check row 13: it says “-4°C” — so that’s negative four degrees Celsius.

Let’s continue correctly.

Row 13: -4°C
→ -4 × 9 = -36
→ -36 ÷ 5 = -7.2
→ -7.2 + 32 = 24.8°F

Row 14: 0°C
→ 0 × 9 = 0
→ 0 ÷ 5 = 0
→ 0 + 32 = 32°F

Row 15: 5°C
→ 5 × 9 = 45
→ 45 ÷ 5 = 9
→ 9 + 32 = 41°F

Row 16: -12°C
→ -12 × 9 = -108
→ -108 ÷ 5 = -21.6
→ -21.6 + 32 = 10.4°F

Row 17: 10°C
→ 10 × 9 = 90
→ 90 ÷ 5 = 18
→ 18 + 32 = 50°F

Row 18: -2°C
→ -2 × 9 = -18
→ -18 ÷ 5 = -3.6
→ -3.6 + 32 = 28.4°F

Row 19: 27°C
→ 27 × 9 = 243
→ 243 ÷ 5 = 48.6
→ 48.6 + 32 = 80.6°F

Row 20: 61°C
→ 61 × 9 = 549
→ 549 ÷ 5 = 109.8
→ 109.8 + 32 = 141.8°F

Row 21: 124°C
→ 124 × 9 = 1116
→ 1116 ÷ 5 = 223.2
→ 223.2 + 32 = 255.2°F

Row 22: 39°C
→ 39 × 9 = 351
→ 351 ÷ 5 = 70.2
→ 70.2 + 32 = 102.2°F

Row 23: -3°C
→ -3 × 9 = -27
→ -27 ÷ 5 = -5.4
→ -5.4 + 32 = 26.6°F

Row 24: 200°C
→ 200 × 9 = 1800
→ 1800 ÷ 5 = 360
→ 360 + 32 = 392°F

Now let’s list all answers in order from 1 to 24:

1. 42°C → 107.6°F
2. 21°C → 69.8°F
3. 35°C → 95°F
4. 9°C → 48.2°F
5. 15°C → 59°F
6. 68°C → 154.4°F
7. 100°C → 212°F
8. 3°C → 37.4°F
9. 72°C → 161.6°F
10. 34°C → 93.2°F
11. 11°C → 51.8°F
12. 77°C → 170.6°F
13. -4°C → 24.8°F
14. 0°C → 32°F
15. 5°C → 41°F
16. -12°C → 10.4°F
17. 10°C → 50°F
18. -2°C → 28.4°F
19. 27°C → 80.6°F
20. 61°C → 141.8°F
21. 124°C → 255.2°F
22. 39°C → 102.2°F
23. -3°C → 26.6°F
24. 200°C → 392°F

Double-checking a few random ones for accuracy:

Check #7: 100°C → should be 212°F (boiling point of water) → correct.

Check #14: 0°C → freezing point → 32°F → correct.

Check #13: -4°C → (-4×9)/5 +32 = (-36/5)+32 = -7.2+32=24.8 → correct.

Check #24: 200°C → (200×9)=1800; /5=360; +32=392 → correct.

All look good.

Final Answer:
1. 107.6°F
2. 69.8°F
3. 95°F
4. 48.2°F
5. 59°F
6. 154.4°F
7. 212°F
8. 37.4°F
9. 161.6°F
10. 93.2°F
11. 51.8°F
12. 170.6°F
13. 24.8°F
14. 32°F
15. 41°F
16. 10.4°F
17. 50°F
18. 28.4°F
19. 80.6°F
20. 141.8°F
21. 255.2°F
22. 102.2°F
23. 26.6°F
24. 392°F