第三单元 三位数乘两位数三位数乘两位数的笔算1.300310971244352.8000 43. C4. 536440177830 274045. 485×12=5820>4999 能购买。6.略用常用数量关系解决实际问题(1)1.964201263609608615248068014002.110千米/时48元/盒单价×数量速度×时间3.从左至右:51179284. 59×12=708(元)4. 240÷80=3(小时)5. (1)240×7=1680(米)(2)1680+240×5=2880(米)6. 78+66=144(元)144÷3=48(元) 78-48=30(元)66-48=18(元)用常用数量关系解决实际问题(2)1.90001996545722.151896763.34×17=578(页)<600页,不能读完。4. 25×(85+68)=3825(千克)5. 125×(30+31+30)=11375(个)11375-10800=575(个)6. 762和95积的变化规律1.10001550240021001600500120020002.一个乘数不变,另一个乘数乘以多少倍数,积也跟着乘以相同的倍数;12030024024003.720720060060001040104004.
5.1010009 6. 7.240 312 3000
乘数未尾有0的乘法(1)1.8006300630100054007203200390320010202.122409823564801440013630608003. 310-120×2=70(箱)4. (155-35)×25=3000(千克)5. 750×93579×30乘数未尾有0的乘法(2)1.6006000600012800128001280300030000300002.420012880780031201136866303. 1770 1800 16004. 260×12=3120<3200 够。5.248和45整理与练习(1)1.15000870140005000840390300016000960064065006902.450040807416455003. (1)80×6=480(千米) (2)600÷40=15(元/套)4. 甲到乙的距离:(74+3)×8=612千米612÷14=44 44+3=47千米/时5. 133×15=1995 372×64=23808整理与练习(2)1.540450018000680 27001000140078002.4347046 |