三年级简便计算题
一、脱式计算。 408-12x24 (46+28) x6042x50-1715-5 32+105-5(108+47)x52 420 x (327-238) (4121+2389)-7671x15-974469x12+1492405x(3213-3189) 5000-56x23125x(97-81)6942+480-3304x32-15420+80-4-20 100-=- (32-30) x0=25x4-12x5 = 70 x〔 (42-42) -18) = 75x65+75x35 = 280+840-24x5 85x(95-1440-24) 58870-(105+20 x2) 80400-(4300+870-15) 1437x27+27x563 125x(33-1) 37.4-(8.6+7.24-6.6) 二、乘法计算: (乘法交换律和乘法结合律的运用:a X b=bXa 乘法分配律的灵活运用 aX (b+c)= aXb+ aXc 125X32X8 4X60X50X8 aXbXc= aX (bXc) (a-b) 12X4X25 Xc=aXc- aXc) 25X125X8X4 25X17X40 19X8X125 25X16X25 125X56 25X24 25X44 125X32 25X4817X4X25 25X33X40 123X47+177X47 57X15+23X15125X32-24X125 173X61-73X61 52X14-22X14 95X46+46X597X360 3X360 724+26X24+724 528X6-6X128 84x101504x25 78x102 25x20499x6499x16 67X9+67865X99+86599X13+13 638x99 72x101-72 112x98 25+399X25 101x32-32382x101-382 35x8+35x6-4x35 35X127-35X16-11X3583X108-83-83X7 87X23-23X6-23x19 99x99+9944 x52+88x24111x36+888x881+791x945+5x95 997x7+21103x8-242008x25125x792 三、除法计算: (除法的性质:a-r b4-c=a-r (b Xc)) 18004-54-272004-454-236004-254-481004-44-7530004-1254-8 12504-254-564004-(64X10)63004-(63X5)81004-814-5 72004-180 四、小数的加减法 5.85+1.89+2.15 24.8+14.6+15.4 5.85-1.75-0.2512.45-1.35-0.65 21.32- (6.32+8.3) 27.3+73.2+72.7 42.5-22.17-7.83 3.8+1.37+6.2+12.63 (15.28+28.99) +20.72 6.5+3.1—4.5 1、口算。 (1) 30+50= (2) 20+70= (3) 40+10= (4) 70+5= (5) 4X3= (6) 1X1 = (7) 2X4= (8) 4X2= (9) 36+24= (10) 59-18= (11) 79-15= (12) 42+38= (13) 4X2+2= (14) 3X3+6= (15) 4+9+2= (16) 7+6+6= (17) 3X2+5= (18) 4X3-4= (19) 3X4-6= (20) 6X6-6= (21) 5X3= (22) 5X5= (23) 47+20= (24) 87-40= (25) 7+8= (26) 20-9= (27) 36+24= (28) 4X6= (29) 54-0= (30) 34-19= (31) 3X6= (32) 5X6= (33) 4X6= (34) 20-6= (35) 3X3= (36) 64-2= (37) 124-2= (38) 104-5= (39) 94-3= (40) 54-5= (41) 54-1 = (42) 3046= (43) 6X4= (44) 244-4= (45) 6X7= (46) 74-1 = (47) 74-7= (48) 7X6+7= (49) 7X4+4= (50) 494-7= (51) 354-5= (52) 284-4= (53) 424-7= (54) 7X7= (55) 144-7= (56) 74-1 = (57) 7X8= (58) 564-7= (59) 16-8= (60) 644-8= (61) 7X8= (62) 484-6= (63) 204-8= (65) 9X4= (67) 544-6= (69) 8X5= (71) 364-4= (73) 284-7X3= (75) 9X44-6= (77) 124-64-2= (79) 244-4X9= (81) 654-7= (83) 824-9= (85) 674-7= (87) 18+27= (89) 29-29= (91) 67+9= (93) 84-8= (95) (3+4) X6= (97) 8X7+5= (99) 5X8+3= (64) 304-9= (66) 8X9= (68) 454-9= (70) 2X8= (72) 164-8= (74) 4X2X3= (76) 54-5X9= (78) 3X84-6= (80) 124-4+38= (82) 714-9= (84) 574-7= (86) 94-9= (88) 100-30= (90) 80-25= (92) 8+46= (94) 72-22+10= (96) 24-4X3= (98) 3X4+9= (100) 9X6+6=