812 + 224 = 1036
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They add up to 1824
Alice found 812-413=399 she added 812+399 to check her work. What did she do wrong?
721 - 224 + 63 = 560
It can be simplified to: 226x+672
813+813+812+808+806+805+804+804+804+803+802+796+792+792+783 =12037 All the operations are addition so all the adding can happen in one step.