question_answer

Express as km using decimals:

(a) 8m

(b) 88 m

(c) 8888 m

(d) 70 km 5 m

Answer:

We know that 1 km = 1000 m

So, \[1\,\text{m}=\frac{1}{1000}\,\text{km}\]

(a)  \[8\text{ m}=8\times \frac{1}{1000}\text{km}=0.008\text{ km}\]

(b) \[88\text{ m}=88\times \frac{1}{1000}\text{km}=0.088\text{ km}\]

(c) \[8888\text{ m}=8888\times \frac{1}{1000}\text{km}=8.888\text{ km}\]

(d) \[70\,\,\text{km}\,\,5\,\,\text{m}=70\,\,\text{km}+5\,\,\text{m}\]

\[=70\,\,\text{km}+\frac{5\times 1}{1000}\text{km}\]

x\[=(70+0.005)km\,\,=70.005\,km\]