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Question

Find 37+(611)+(821)+(522).

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Solution

37+(611)+(811)+(522)

=198462+(252462)+(176462)+(105462)

(Note that 462 is the LCM of 7, 11, 21, and 22)

=198252176+105462=125462

We can also solve it as

37+(611)+(811)+522=[37+(821)]+[611+522]

(by using commutative and associativity)

=[9+(8)21]+[12+522]=121+(722)=22147462=125462

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