Calculate with an explanation. Check calculations to put or subtract sizes conveniently to transfer them to uniform small units of measure and then to execute calculations 697-85=612 897-560=337 645+234=879 323+826=1149 432+523=955 462+205=667

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697-85=692-80=612 897-560=837-500=337 645+234=649+230=679+200=879 323+826=329+820=349+800=1149 432+523=435+520=455+500=955 462+205=467+200=667
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Answer add