**Question 1:**
What is LCM (the least common multiple) of $4$
and $5$
?

**Question 2:**
What is LCM of $5$
and $10$
?

**Question 3:**
What is LCM of $8$
and $6$
?

**Question 4:**
Write $32$
as a product of prime numbers

**Question 5:**
Write $40$
as a product of prime numbers

**Question 6:**
Write $50$
as a product of prime numbers

**Question 7:**
What is HCF (the highest common factor) of $15$
and $20$
?

**Question 8:**
What is HCF of $48$
and $24$
?

**Question 9:**
What is HCF of $27$
and $18$
?

**Question 10:**
Solve ${2}^{2}\cdot 3\cdot 5$