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1、乘法交换律、结合律练习题乘法交换律:aXb=bXa乘法结合律:(aXb) Xc=aX (bXc)观察算式中数的特点,运用乘法交换律、结合律进行计算。38X25X442X125X8(25X125) X (8X4)49X4X538X125X8X3(125X25)X45 X289X2(125X12) X8125X (12X4)乘法交换律和结合律的变化练习 125X64125X8844X25125X2425X2825X12加法交换律:a+b=b+a 357+288+143加法交换律、结合律练习题加法结合律:(a+b) +c=a+ (b+c)158+395+105167+289+33129+235+17
2、1 + 165138+293+62+107169+78+229X72X12598X42(2130+783+270)+1017简便计算练习题7158+262+138158+262+138375+219+381+225观察算式的特点并计算。 102X355001-247-1021-232(181+2564) +2719378+44+114+242+222(375+1034)+(966+125)(2130+783+270)+10172214+638+2862357-183-3172365-1086-214158+262+138375+219+381+2255001-247-1021-232(181+
3、2564) +2719102214+638+286简便计算 班级:2365-1086-214 姓名:42x125x8x5简便计算练习题8观察算式的特点并计算。 12X2575X24102X76138X25X4(13X125)X(3X8)(12+24+80) X5025X32X12532X(25+125)88X125178X101-17884X36+64X8475X99+2X7598X199123X18-123X3+85X12350X(34X4)X379X42+79+79X5725 X (24+16)178X99+17812第一类:加 65+73+135357+288+143272+68+281
4、29+235+171+16517+145+23+356+7+8+102+103+104第二类:减 400-256-44517-53-47284-159-41258-42-16545-167-145478-47-178第三类:乘45x4x523 x5x225x9x4简便计算班级: 姓名:8x (125x13)(250x125) x (4x8)25x4x88x12588x12572x125125x64x25第四类:乘(12+50) x40125x (40-4)76x10318x12525x4499x22+33x3442x2599x999x78第五类:乘45x37+37x5528x21+28x791
5、7x23-23x738x46+64x3899x32+32167x2+167x3+167x539x8+6x39-39x446+46x5928x225-2x225-6x22514乘法分配律及反响用练习题乘法分配律:(a+b) Xc = aXc+bXc 正用练习(80+4) X25(20+4) X25(125+17) X825X (40+4)25X (40+4)15X (20+3)乘法分配律正用的变化练习: 36x99乘法分配律正用的变化练习: 36x9925x4139x101125x88201X2484x101乘法分配律反用的练习: 34X72+34X2835X37+65X3785X82+85X1
6、825X97+25X376X25+25X2475X299+75乘法分配律反用的变化练习: 38X29+3864X199+6435X68+68+68X64简便计算班级: 姓名:【经典例题一】计算25x125x4x8【思路导航】如果先把25与4相乘,可以得到100,同时把125与8相乘,可以得到1000; 再把100和1000相乘就可以了。运用了乘法交换律和结合律。25x125x4x8=(25x4) x (125x8)=100x1000【练一练】(1) 125x15x8x4(2) 25x24(3) 125x16(4) 75x16(5) 125x25x32(6) 25x5x64x125【经典例题二】
7、计算:(1) 125x34+125x66(2) 43x11+43x36+43x52+43【思路导航】利用乘法分配律来计算这两题(1) 125x34+125x66 =125x (34+66) =125x100 =12500【练一练1】计算下面各题: (1) 125x64+125x36(2) 43x11+43x36+43x52+43 =43x (11+36+52+1) =43x100 =4300(2) 64x45+64x71-64x16(3) 21x73+26x21+21【练一练 2】(1) 125x15x8x4(2) 25x24(3) 125x16(4) 75x16(5) 125x25x32(6
8、) 25x5x64x125【练一练3】计算下面各题:(1) 125x64+125x36(2) 64x45+64x71-64x16(3) 21x73+26x21+21简便计算练习题1观察算式的特点并计算。158+262+138375+219+381+2255001-247-1021-232(181+2564) +2719378+44+114+242+222276+228+353+219(375+1034)+(966+125)(2130+783+270)+10172214+638+2862365-1086-21412x2575x24138x25x4(13x125)x(3x8)(12+24+80)x
9、50简便计算 班级: 姓名:简便计算练习题2观察算式的特点并计算。25x32x12532x(25+125)704x2588x125102x7658x98178x101-17884x36+64x8475x99+2x7583x102-83x298x199123x18-123x3+85x12350x(34x4)x325x (24+16)178x99+17879x42+79+79x57638x9978X4+78X3+78X3简便计算练习题3观察算式的特点并计算。75x27+19x2 513x870+13x31025x204(300+6)x1225x(4+8)125x(32+8)72X125504x25
10、78x10299x6499x16999x9999X13+1325+199X2532X16+14X32125X32X825X32X12588X125简便计算 班级: 姓名:简便计算练习题42100-728-7722100-728-772273-73-27观察算式的特点并计算。 1200-624-76278+463+22+37732+580+2681034+780+320+102178X101-17883X102-83X217X23-23X735X127-35X16-11X35847-527-273425+14+186378+44+242+222276+228+353+219(375+1034)
11、+ (966+125)75X24138X25X4(13X125)X(3X8)简便计算练习题5观察算式的特点并计算。(12+24+80) X50704X2525X32X12588X125102X7658X9884X36+64X8475 X 99+2 X 7583X102-83X2123X18-123X3+85X12350X(34X4)X325X (24+16)178X99+17879X42+79+79X5712X25简便计算 班级: 姓名:32X(25+125)98X199178X101-178简便计算练习题6356X9-56X9356X9-56X999X55+55观察算式的特点并计算。 26X39+61X2678X101-7852X76+47X76 + 76134X56-134+45X13448X52X2-4X4825X (40+4)999X999+999380+476+120(569+468) + (432+131)704X2528X4X25256-147-53125X32X25
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