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Help, What is the greatest common factor of each set of numbers

1. 24,60 2. 7,9 3. 9,12,15
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4.How Does finding the greatest common factor help someone solve real-world problems?
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5. Fourteen boys and 21 girls will be equally divided into groups.Find the greatest number of groups that can be created if no one is left out.
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Sorry for asking for so much,the teacher did not explain how to do this.He just said do it.

Answer :

wikk
1. 24, 60
24 = {1, 2, 3, 4, 6, 8, 12, 24}
60 = {1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30, 60}
The GCF is 12.

2. 7, 9
7 = {1, 7}
9 = {1, 3, 9}
The GCF is 1.

3. 9, 12, 15
9 = {1, 3, 9}
12 = {1, 2, 3, 4, 6, 12}
15 = {1, 3, 5, 15}
The GCF is 3.

4. An example of this is #5. It can help you figure out what the greatest amount you can have is.

5. 14 boys and 21 girls.
14 + 21 = 35
Find the multiples of 35.
{ 1, 5, 7, 35 }
Obviously 35 can't be used, because there will be only 1 group. So the greatest number of groups would be 7, each containing 5 students.

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