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Mental math and associative property of addition
i look at 173 and 427 and see that
73+27=100
i add now the 100(from 173)+400(from 427)+100(see above)=600
easy
600+301=901
Answer:
17400
Step-by-step explanation: i might get this wrong but just do 1.74*10^4 and it should equal 17400
