Answer :
Given that, 5 hectares = 5 × 10000 m2 (∵1 hectare = 10000 m2)
= 5 × 10000 × 100 × 100 cm2
Standard form = 5 × 10000 × 100 × 100
= 5 × 10 × 10 × 10 × 10 × 10 × 10 × 10 × 10
Using the law of exponent, 
= 5 × 108 cm2
∴ The standard form is 5 × 108 cm2
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