34×12=
42×12=
23×21=
33×13=

解:34×12=408;
  34

;

42×12=504;
 42

;

23×21=483;
  23



33×13=429;
  33


分析:根據(jù)乘數(shù)是兩位數(shù)的乘法豎式計(jì)算的方法求解.
點(diǎn)評(píng):本題考查兩位數(shù)乘上兩位數(shù)筆算的方法,計(jì)算時(shí)要細(xì)心,注意把數(shù)位對(duì)齊.
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