The temperature of a substance rises from $-3℃$ to $12℃$.
Calculate the increase in temperature of the substance.

Work out:
(a) $11-3\times 2+\frac{3}{4}$ of 24

(b) $\frac{1}{1-3{\left(0.5\right)}^2}$

(a) Evaluate:
(i) $4\frac{3}{7}-1\frac{7}{9}$

(ii) $\frac{2}{3}÷7\frac{3}{4}$

Work out $\frac{3}{4}-\frac{1}{2}+\frac{1}{6}$.

At noon in Oxbow the temperature was $3℃$.
At midnight the temperature has fallen by $8℃$.
Find the temperature at midnight.

Lineo spends $7\frac{1}{2}$ hours at the stadium watching games.
She leaves the stadium at 4.20 p.m.
At what time did she arrive at the stadium?

(a) Work out:
(i) $1\frac{2}{3}÷1\frac{3}{4}$

(ii) $0.5\times 0.007$

(b) Work out:
(i) $2\sqrt{8}\times 4\sqrt{8}+2$

Write 800 020 160 in words.

Calculate $\frac{5^2}{2^5}$.
(a) Giving your answer as a fraction,

(b) Giving your answer as a decimal.