估算下面各题.72×33≈______×______=______;?
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解题思路:根据整数乘法的口算和利用四舍五入法进行估算的方法即可解答.
72×33≈70×30=2100;
82×69≈80×70=5600;
39×28≈40×30=1200;
59×44≈60×40=2400.
故答案为:70,30,2100;80,70,5600;40,30,1200;60,40,2400.
,10,估算下面各题.
72×33≈______×______=______;
82×69≈______×______=______;
39×28≈______×______=______;
59×44≈______×______=______.
72×33≈70×30=2100;
82×69≈80×70=5600;
39×28≈40×30=1200;
59×44≈60×40=2400.
故答案为:70,30,2100;80,70,5600;40,30,1200;60,40,2400.
,10,估算下面各题.
72×33≈______×______=______;
82×69≈______×______=______;
39×28≈______×______=______;
59×44≈______×______=______.
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