Question 155

$$122 \times 252 - 12234 =$$ ?

122*252-12234

= 122*252-((122*100)+34)

=122*152-34

=122*(122+30)-34

= $$122^{2}$$ +3660-34

= $$(120+2)^{2}$$ +3626

=14400+4+480+3626

=18510

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