Question

Evaluate:
9 × 6 × (– 10) × (– 20)

Answer 1

$= 9 \times 6 \times ( - 10) \times ( - 20) \: \: here \: ( - \times - = + ) \\ \\ = 54 \times ( - 10) \times ( - 20) \\ \\ = - 540 \times - 20 \\ \\ = 10800$

Answer 2

Solution :

9 × 6 × ( -10 ) × ( -20 )

= 54 × [ ( -10 ) × ( -20 ) ]

= 54 × 200 [ - × - = + ]

= 10800

Therefore ,

9 × 6 × ( - 10 ) × ( -20 ) = 10800

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