(a)[2]
By rounding each number correctly to $1$ significant figure, show that an estimate for this calculation is $20$. $\frac{9.78 + 31.562}{0.381 \times 5.09}$
(b)[2]
Arrange these numbers in ascending order, smallest first: $\frac{22}{7},\ 3.142,\ \frac{333}{106},\ 3.1416$.
(c)[2]
Complete the statement concerning the value of $p$.
(d)[2]
Calculate $3.142 \times \frac{52\,163}{16\,604}$. Give your answer in standard form, correct to $2$ significant figures.