Find product use [ Distributive property of
multiplication over addition]
Property [a(b+c) = a×b + a×c]
(-21)×(-30)
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The distributive property of multiplication over addition can be used when you multiply a number by a sum. For example, suppose you want to multiply 3 by the sum of 10 + 2. 3(10 + 2) = ? According to this property, you can add the numbers and then multiply by 3.
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Your example of your question is different and my example of your question is different but the formula is same so your question also will solve by this method
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