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(d) 1005 × 168

= (1000 + 5) × 168

= (168 × 1000) + (168 × 5)

[By the distributive property of multiplication over addition]

= 168000 + 840

 Zero property of whole numbers:
 Addition property of zero
Any whole number when added with zero remains the same; this is called the zero property of
addition of whole numbers. For example, 0 + 7 = 7, 6 + 0 = 6.
 Multiplication property of zero
Any whole number when multiplied with zero the result always becomes zero; this is called the zero
property of multiplication of whole numbers. For example, 0 × 7 = 0, 6 × 0 = 0.

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