Here are the solutions to the problems. MENTAL MATHS: Round the following numbers off: Note: For the "Nearest thousands" column, it is assumed that "thousands" is a typo and should be "thousandth" given the context of decimal fractions. If it literally meant "Nearest thousands" (whole number), the answers would be $0$, $0$, and $2000$ respectively. | Number | Nearest Unit | Nearest tenth | Nearest hundredth | Nearest thousandth | | :---------------- | :------------- | :------------ | :---------------- | :----------------- | | $64.45369$ | $\boxed{64}$ | $\boxed{64.5}$ | $\boxed{64.45}$ | $\boxed{64.454}$ | | $9.8472$ | $\boxed{10}$ | $\boxed{9.8}$ | $\boxed{9.85}$ | $\boxed{9.847}$ | | $2345.9991$ | $\boxed{2346}$ | $\boxed{2346.0}$ | $\boxed{2346.00}$ | $\boxed{2345.999}$ | Activity 1: Complete the following multiplication table. | Number | multiply by $1$ | multiply by $10$ | multiply by $100$ | | :------------- | :-------------- | :--------------- | :---------------- | | $5$ | $\boxed{5}$ | $\boxed{50}$ | $\boxed{500}$ | | $5.3$ | $\boxed{5.3}$ | $\boxed{53}$ | $\boxed{530}$ | | $0.5$ | $\boxed{0.5}$ | $\boxed{5}$ | $\boxed{50}$ | | $3.75$ | $\boxed{3.75}$ | $\boxed{37.5}$ | $\boxed{375}$ | | $45.5$ | $\boxed{45.5}$ | $\boxed{455}$ | $\boxed{4550}$ | | $0.2$ | $\boxed{0.2}$ | $\boxed{2}$ | $\boxed{20}$ | Activity 2: a) Complete the following multiplication table. | Number | multiply by $3$ | multiply by $5$ | multiply by $10$ | | :------------- | :-------------- | :-------------- | :--------------- | | $3.12$ | $\boxed{9.36}$ | $\boxed{15.60}$ | $\boxed{31.2}$ | | $0.5$ | $\boxed{1.5}$ | $\boxed{2.5}$ | $\boxed{5}$ | | $3.72$ | $\boxed{11.16}$ | $\boxed{18.60}$ | $\boxed{37.2}$ | | $15.25$ | $\boxed{45.75}$ | $\boxed{76.25}$ | $\boxed{152.5}$ | | $0.2$ | $\boxed{0.6}$ | $\boxed{1}$ | $\boxed{2}$ | Activity 2: b) The problems for this section are not visible in the image provided.