What two ways can you find the product of 8x997 using mental math

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25-08-2017
Mathematics

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What two ways can you find the product of 8x997 using mental math

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apologiabiology apologiabiology · Answer 1 · 2017-08-25T04:21:45+02:00

apologiabiology apologiabiology

25-08-2017

8=10-2 or
997=1000-3
so we can use distributive property
remember, a(b+c)=ab+ac

for the first one
8(997)=(10-2)(997)=997(10-2)=997(10)+997(-2)=9970-1994=7976

2nd one
8(997)=8(1000-3)=8(1000)+8(-3)=8000-24=7976

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