Use division of find the factors of each number. Then write if the number is prime composite. 1) 5. 2) 20. 3) 26. 4) 31.
To find the factors of each number and determine if they are prime or composite, we need to use division.
1) Number: 5
Factors: We can divide 5 by 1 and 5.
Since 5 only has two factors (1 and itself), it is a prime number.
2) Number: 20
Factors: We can divide 20 by 1, 2, 4, 5, 10, and 20.
Since 20 has more than two factors, it is a composite number.
3) Number: 26
Factors: We can divide 26 by 1, 2, 13, and 26.
Since 26 has more than two factors, it is a composite number.
4) Number: 31
Factors: We can divide 31 by 1 and 31.
Since 31 only has two factors (1 and itself), it is a prime number.
Therefore, the answers are:
1) 5 is a prime number.
2) 20 is a composite number.
3) 26 is a composite number.
4) 31 is a prime number.