Answers with Method:-
1) Multiply the length value by 100,000.
[tex]2.5 \: hm = 2.5 \times 100000[/tex]
[tex] = >2.5 \: hm = 250000 \: mm[/tex]
2) For this, divide the length value by 1000.
[tex] = > \frac{1800}{1000} [/tex]
[tex] = > 1.8 \: dam[/tex]
3) For finding the approximate value, just multiply the value of length by 1.609.
[tex] = >6450 \: m = (6450 \times 1.609) \: km[/tex]
[tex] = > 10380.27 \: km[/tex]
4) Multiply the given mass value by 100.
[tex] = > 1.2 \: kg = 1.2 \times 100 [/tex]
[tex] = > 1200 \: g[/tex]
5) Multiply the given value by 10,000.
[tex]4.37 \: dag = 4.37 \times 10000[/tex]
[tex] = > 43700 \: mg[/tex]