LCM of $3, 4$ and $5$ is .

Find the LCM and HCF of $6$ and $20$ by the prime factorisation method.

If $\frac{1}{y+z}+\frac{1}{z+x}=\frac{2}{x+y}$ then what is the value of $x^2+y^2$? 

Find the first two common multiples of $4$ and $5$.

Find the first two common multiples of $3$ and $5$.

Find the factors of $60$.

Find out the factors of number $2$ using dot sheets and also what are the numbers having multiple as $2$.

Find the factors of $100$.

Find out factors and multiples of the numbers given below using dot sheets.

$5$

Since, $7\times 3=21$, $21$ is a multiple of both $7$ and $3$.

Find out the factors of number $7$ using dot sheets and also what are the numbers having multiple as $7$.

Find out the factors of number $9$ using dot sheets and also what are the numbers having multiple as $9$.

Match the items in column $1$ with the items in column $2:$