B Nirmala Shastry Solutions for Exercise 7: EXERCISE 4.7

Determine whether the following numbers are divisible by $15$.

$\mathrm{5,43,210}$

Determine whether the following numbers are divisible by $12$.

$2784$

Determine whether the following numbers are divisible by $12$.

$\mathrm{7,24,560}$

Determine whether the following numbers are divisible by $12$.

$\mathrm{4,67,744}$

A number is divisible by both $4$ and $6$. Can we say that this number must be divisible by $4\times 6=24$? Give reason.

Give a number which is divisible by both $2$ and $4$ but not by $8$.

Give a number which is divisible by $4$ and $8$ but not by $32$.

Give a number which is divisible by $6$ and $15$ but not by $90$.