人教版四年级数学下册
简便运算
简便运算
计算:
4×89×25
7×125×8
25×(200+4)
计算:182×25
182×25
= (100+82)×25
=100×25+82×25
=2500+2050
=4550
182×25
=(200-18)×25
=200×25-18×25
=5000-450
=4550
182×25
=182×5×5
=910×5
=4550
182×25=4550
(笔算)
计算:12×103 25×(409-9)
计算:25+67×4
计算:8×117+ 117×12 45×103-3
(1)102×56
=(100+2)×56
=100×56+2
=5602
( )
102×56
=(100+2)×56
=100×56+2×56
=5712
(2)27×48+63×48
=48×(27+63)
=48×100
=4800
( )
27×48+63×48
=48×(27+63)
=48×90
=4320
×
×
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