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What is the value of 9991 10009

This question belongs to Arithmetic Ability Number System
Number System
?

What is the value of 9991 × 10009?

Answer & Solution
Correct Answer: Option C
9991 × 10009
= 9991(10000 + 9)
= 99910000 + 89919
= 99999919

Alternate solution
9991 × 10009
= (10000 - 9)(10000 + 9)
= (10000)2 - (9)2
= 100000000 - 81
= 99999919
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