Use Euclid's division algorithm to find the $HCF$ of $196$ and $38220$.

Express $3825$ as a product of its prime factors.

Without actually performing the long division,state whether the following rational number will have a terminating decimal expansion or a non-terminating repeating decimal expansion: $\frac{17}{8}$.

Find the $LCM$ and $HCF$ of the following integers by applying the prime factorisation method: $17, 23$ and $29$.

Use Euclid's division algorithm to find the $HCF$ of $867$ and $255$.

Write down the decimal expansion of the rational number $\frac{17}{8}$.