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306×42怎么验算

306乘21等于多少验算怎么验算? 解:采用分配律, 原式=306x(20+1) =306x20+306 =6120+306 =6426 验算: 6426÷21 =306

306×24=7416

=300×35+6×35 =10500+210 =10710

78×306=23868 验算: 23868÷306=78 或: 306×78=23868

359+306计算并验算 359+306=665 验算: 665-306=359 或: 306+359=665

306x35的验算 306x35 =35X(300+6) =35x300+35x6 =10500+210 =10710

如图

306÷6=51 验算:6×51=306

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