六年级数学口算及简便方法

1、六年级数学口算及简便方法六年级数学口算及简便方法六年级数学总简便计算练习题一、口算部分。（10分）10 2.65 = 0+3.8= 9X0.08 = 24+0.4 = 67.5 +0.25 = 6 + 14.4 = 0.77 +0.33 =5 -1.4 -1.6 =+ 3X = 77二、用简便方法计算部分。(90分，4X20+5X2)1125 -997 998+1246 4+3.2 +5+6.8 12 -(1+2) 400 +125+ 8 25 X (37X8)1134413( 一)X 12 1 X2X 34 X(2 +) 125 X8.8 4.35 + 4.25 + 3.65 +3.75 3

2、.4 X 99+ 3.4 46415734535715217.158.47 1.53 17 -3-4 -2+X 0.125 X 0.25 X 32 22.3 2.45 -5.3 -4.556469511980X0.125=(1*533X7 144) 1*4+ +) X72 4.25 - 3-(2 -1) 187.7 X 11 -187.7 43 X + 57.125 X-0.5 3152.42 +34+4.58X 1134+3 213 11712232 X 6.6+2.5 X65 8 63 -3 4.6+35 +65 +5.41*58+2.25+58+74 75+47+25 11-167 +1

3、611 23447+39 -37+19 +172.8+5459 +7.2+39 0.75+58 14+0.375 44 (24555 12)*4+ 9 +999 +9999 48.3-15 -4 9 X 4.25+4 +6 0.625 X0.5+ X62.5% 31 X 72 +3116 +(2 -1.8)*572.5 X (910 +910 +910 +910 ) 22 X 34 +25 X 75% - 7X 0.75(111+999) + 56 X(37 -38) 49.5 X 315-(50- 2 ) X 0.6314X(538 -5.375) 3.5 X 11744 +1.25X210

4、 +3.8+50.25 X 63.514 X 1312 6715 X2.5 -212 X4715 89179+18 1125-996711X41419 +5519+147 +774311 45 X9+15- 0.6) 8978 37.5%+104X 0.375 71 X 99 3755+2996 8439+1001 446+295 888+999 372X 156- 56X72 25 X 32X 125 709 X 99+709 14. 0.25 X 48 2.5 X 0.4 X 2 299 X 101 563 9992126.6+2.5 X635 117861312375.3 X 99+75

5、.3 1533144.254 4.6 X 3.7+54 X 0.37 19.82 6.573.43 0.125 X3418X 8.25+12.5% 8.37 -3.25-(1.37+1.75) 4.6+32533535+5.4 48+2.25+58+74 9.63+2.5+4 42100+ 20 6 +0.253 *X+XX+18X ( +) X7+X5 () x ( 24 )+4 ) + 4777(32 X 14+17) +5127887 1516279 96336125*(3+5)x 13 3 X 7+3X5 ( 2116-12) X 245)(7X7+7)+ 7+ ( 53+5) X 13(25+ 34) -14+1184X9+7X9+ 9 (21X 3 + 4X21) X 1 ( 99+9) +9 452516167410 5X6+*1+ ( + )><( + )X30+3+X +4 1*52 6510511114455X 7X4 12 10 -712119 - 19 + 194556 +25+35 25X 13 +52X310 45X58+X41 +135+ 18 12 X 103 4500+ 75 6+