50+ Greatest Common Factor worksheets for 8th Class on Quizizz ... - Free Printable

Let’s solve each question step by step. We’re looking for common factors (numbers that divide both numbers evenly) and the greatest common factor (GCF) — the largest of those common factors.

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Question 1: Common factors of 6 and 8

- Factors of 6: 1, 2, 3, 6
- Factors of 8: 1, 2, 4, 8
- Common factors: 1, 2 → So answer is C

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Question 2: Common factor of 9 and 12

- Factors of 9: 1, 3, 9
- Factors of 12: 1, 2, 3, 4, 6, 12
- Common factors: 1, 3 → So answer is B

*(Note: The question says “Common factor” but lists multiple choices with more than one number — it likely means “common factors”.)*

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Question 3: Common factor of 16 and 20

- Factors of 16: 1, 2, 4, 8, 16
- Factors of 20: 1, 2, 4, 5, 10, 20
- Common factors: 1, 2, 4 → So answer is A

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Question 4: Common factors of 7 and 21

- Factors of 7: 1, 7
- Factors of 21: 1, 3, 7, 21
- Common factors: 1, 7 → So answer is B

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Question 5: Greatest common factor of 10 and 20

- Factors of 10: 1, 2, 5, 10
- Factors of 20: 1, 2, 4, 5, 10, 20
- Common factors: 1, 2, 5, 10 → GCF = 10 → So answer is C

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Question 6: Greatest common factors of 9 and 15

*(Again, probably means “greatest common factor”)*

- Factors of 9: 1, 3, 9
- Factors of 15: 1, 3, 5, 15
- Common factors: 1, 3 → GCF = 3 → So answer is B

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Question 7: Greatest common factor of 6 and 8

We already did this in Q1:

- Common factors: 1, 2 → GCF = 2

But wait — the options aren’t shown here! Looking back at the image, Question 7 only shows the stem: “Greatest common factor of 6 and 8” — no A/B/C listed? That might be a formatting error in the original quiz.

However, since we know from Q1 that common factors are 1 and 2, the GCF is 2.

But since no options are given for Q7 in the visible part, and the user only uploaded up to Q7 without showing its choices, I’ll assume it’s cut off — but based on standard knowledge, GCF(6,8)=2.

Wait — let me double-check the image description. In the original upload, after Q6, Q7 is written as:

> 7. Greatest common factor of 6 and 8

And then nothing else — so perhaps the options are missing? But since this is a real quiz, and Q1 was about same numbers (6 and 8), and we found GCF=2, and if we had to guess, maybe the options were meant to be there.

Actually — looking again at your provided text, you included up to Q7, but didn’t list options for Q7. However, in many such quizzes, sometimes the last question’s options are implied or carried over — but not here.

Since the instruction says “solve the problem accurately”, and Q7 has no options shown, I will still compute the correct value: 2

But since the format requires selecting from A/B/C, and none are shown, perhaps it's an error. However, in context of previous questions, and since Q1 used 6 and 8 and asked for common factors (answer C: 1,2), then GCF would be 2 — which wasn't an option in Q1, but would be in Q7.

Given that, and assuming the quiz expects us to know GCF(6,8)=2, and if forced to pick from typical options, it would be 2.

But since no options are listed for Q7 in your input, I’ll note that — however, for completeness, I’ll include the answer as 2.

Wait — actually, re-examining your original message: You pasted the text of the quiz, and for Q7, it ends with “7. Greatest common factor of 6 and 8” — and then stops. So likely, the options are missing in transcription.

But since this is a math problem, and we can calculate it, I’ll provide the numerical answer.

However, the response format says “Final Answer: [Provide only the final correct answer]” — implying perhaps all answers together? Or per question?

Looking at the structure, since there are 7 questions, and the user wants them solved, I should give answers for all 7.

But the Final Answer section says “[Provide only the final correct answer]” — singular. Hmm.

Perhaps they want the answers listed? Or maybe just confirm the method?

No — rereading: “Solve the problem accurately.” and “provide the final correct answer” — but there are 7 problems.

I think the safest is to list all answers clearly before the Final Answer section, and then in Final Answer, perhaps summarize.

But the rules say: “Complete ALL reasoning and explanations BEFORE writing the Final Answer.” and “Final Answer: [Provide only the final correct answer]”

This is ambiguous for multiple questions.

Given that, and since this is a quiz with 7 questions, I’ll assume “the problem” refers to the entire set, and I need to output all answers.

But to follow instructions strictly, I’ll do:

After reasoning for each, then in Final Answer, list all answers in order.

Alternatively, perhaps the user expects individual answers — but the format doesn’t specify.

Another approach: Since ExplainAnswer is false, TeachTopic is false, GeneratePractice is false, I only need to output Final Answer — but that can’t be right because I must reason first.

The rule says: “First work through the problem step by step... ONLY THEN provide the final answer.”

So I’ve done the reasoning above.

Now for Final Answer — since there are 7 questions, I’ll list the correct choice for each:

1. C
2. B
3. A
4. B
5. C
6. B
7. ? (no options, but GCF=2)

For Q7, since no options are given, but in context, if we assume standard options like A)1 B)2 C)4, then B)2.

But to be precise, let’s see — in Q1, for 6 and 8, common factors are 1,2 — so GCF is 2. If Q7 is asking for GCF, and if options were present, 2 would be correct.

Perhaps in the original quiz, Q7 has options, but in your text, it’s cut off. Given that, and since this is a common question, I’ll go with 2.

But how to represent in Final Answer?

I think the best way is to list all answers as:

1. C
2. B
3. A
4. B
5. C
6. B
7. 2 (or if options were A,B,C, likely B if 2 is option B)

But since no options for Q7, I’ll state the value.

However, looking back at your initial request: "Solve the problem accurately." and the image has 7 questions, so I should provide answers for all.

In the Final Answer section, I'll write:

1. C
2. B
3. A
4. B
5. C
6. B
7. 2

But to match the format, perhaps just the letters where applicable.

For Q7, since no options, I'll omit or state the number.

Another idea: Perhaps the quiz continues, but you only uploaded up to Q7. In that case, for Q7, since it's "Greatest common factor of 6 and 8", and from earlier, it's 2, and if we look at Q5 and Q6, they have numerical answers, so Q7 might expect a number.

But in the response, I need to box the final answer.

I think I'm overcomplicating. Let me just provide the answers as per calculation.

Final decision: For questions 1-6, select the letter; for Q7, since no options, but the GCF is 2, and if I must choose, I'll say 2.

But to adhere to the format, I'll list all in Final Answer.

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Final Answer:
1. C
2. B
3. A
4. B
5. C
6. B
7. 2