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[tex]\large\color{re}{{\rm{ANSWER:}}}[/tex]
1. 20,000 sq. cm. = [tex]\small\boxed{\sf 2 }[/tex] sq. m.
2. 70,000 sq. cm. = [tex]\small\boxed{\sf 7 }[/tex] sq. m.
3. 420,000 sq. cm. = [tex]\small\boxed{\sf 42 }[/tex] sq. m.
4. 4 sq. m = [tex]\small\boxed{\sf 40000 }[/tex] sq. cm.
5. 10 sq. m. = [tex]\small\boxed{\sf 100000 }[/tex] sq. cm.
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