Answer:

4.D

5.B

6.D

7. B

8.B

9.C

10.D

Answer:

4. D. 28

5. D. 2

6. D. 2 × 2 × 2 × 2

7. B. 4

8. B. 2

9. C.

10. D. 221

Step-by-step explanation:

4.

• Multiples of 14: 14, 28, 42, 56, 70, 84, 98, 112, 126, 140,...
• Multiples of 28: 28, 56, 84, 112, 140, 168, 196, 224, 252, 280,...
• LCM = 28

5.

• Factors of 4: 1, 2, 4
• Factors of 6: 1, 2, 3, 6
• GCF = 2

6.

• Prime factors of 16: 2
• Prime factorization of 16 = 2 × 2 × 2 × 2

7.

• The smallest composite number is 4. This is because the factors of 4 are 1, 2, and 4. Since it has at least three factors, it is a composite number.

8.

• The smallest non-zero number is 1.  
• Factors of 1: 1
• 1 has only one factor which is 1 itself.  
• The next smallest non-zero number is 2.  
• Factors of 2: 1 and 2  
• It has only two factors, 1 and the number itself 2.
• A prime number is a natural number greater than one that is not a product of two less natural numbers. 
• Therefore, 2 is the smallest prime number.

9.

• Composite numbers from 40- 50: 40, 42, 44, 45, 46, 48, 49, and 50.
• Sum of composite numbers from 40- 50: 40 + 42 + 43 + 44 + 45 + 46 + 48 + 49 + 50 = 405.

10.

• Between numbers lie in the middle of two numbers. Therefore, 11 and 19 are not included.
• Product of the prime numbers between 11 and 19: 13 ×  17 = 221

Note: Least Common Factor and Greatest Common Multiple are not applicable in Mathematics. Obviously, the Least Common Factor of every 2 or more numbers is 1. On the other hand, it is very hard to find the Greatest Common Multiple of 2 or more numbers since there are infinite integers.

I hope it helps! Thank you! ❤️