三年级四则运算题50道（三年级四则运算练习题100道）

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1、1/6x3/8-3/8÷6=1/6x3/8-3/8x1/6=1/6x(3/8-3/8)=1/6x0=0 4/7×5/9+3/7×5/9=(4/7+3/7)x5/9=1x5/9=5/9 5/2-（3/2+4/5）=5/2-3/2-4/5=1-4/5=1/5 6×（1/2+2/3）=6x1/2+6x2/3=3+4=7 8×4/5+8×11/5=8x(4/5+11/5)=8x3=24 31×5/6–5/6=(31-1)x5/6=30x5/6=25 4/5×25/16+2/3×3/4=5/4+1/2=5/4+2/4=7/4 101×1/5–1/5×21=(101-21)x1/5=80x1/5=164800÷25÷4=4800÷(25x4)=4800÷100=4800÷100=48 0.92x15+0.08x15=(0.92+0.08)×15=1×15=15 0.72×1.25×2.5=0.9×(0.8×1.25)×2.5=0.9×1×2.5=2.25 60×(1/12+1/15+1/4)     =60×1/12+60×1/15+60×1/4=5+4+15=24 (5/12-3/8)×72 =5/12×72-3/8×72=30-27=3 6/7-5/24÷7/12     =6/7-5/24×12/7=12/14-5/14=7/14=1/2 [3/4×(7/16-1/4)]÷9/13=3/4×（7/16-4/16）×13/9=1/4×3/16×13/3=13/64 2/3-7/8+1/3=(2/3+1/3)-7/8=1-7/8=1/8 5/6-(3/7-1/6)=(5/6+1/6)-3/7=1-3/7=4/7 1-1/3-2/3=1-(1/3+2/3)=1-1=0 1+3/5-1/10=1+6/10-1/10=1+1/2=1又1/2 3/8-12/13+5/8=3/8+5/8-12/13=1-12/13=1/13 1-(1/2-3/4)=1+3/4-2/4=1+1/4=5/4 1-1/2-1/4=1/2-1/4=2/4-1/4=1/4 2/7-8/9+5/7=(2/7+5/7)-8/9=1-8/9=1/9 2-1/4-3/4=2-(1/4+3/4)=2-1=1 1/2-(3/8-1/2)=1/2+1/2-3/4=1-3/8=5/8 7×25/26=7x(1-1/26)=7x1-7x1/26=7-7/26=6又19/26 18又9/10×1/9=(18+9/10)x1/9=18x1/9+9/10x1/9=2+1/10=2又1/10 21又1/19×1/20=(20+20/19)x1/20=20x1/20+20/19x1/20=1+1/19=1又1/19 (25+2又5/21)×21/26=(26+26/21)x21/26=26x21/26+26/21x21/26=21+1=22 6/11×3/7+4/11×6/7=6/11x3/7+6/11x4/7=6/11x(3/7+4/7)=6/11x1=6/11 2.64×1.7-2.64×0.7=2.64×(1.7-0.7)=2.64×1=2.64 31.5×1.07-3.15×0.7=3.15×10.7-3.15×0.7=3.15×(10.7-0.7)=3.15×10=31.5 2.7×5.7-2.7+5.3×2.7=2.7×(5.7-1+5.3)=2.7×10=27 0.625÷0.125×0.8=(0.625×0.8)×8÷(0.125×8)=0.5×8÷1=4 18.6×6.1+3.9×18.6=18.6×(6.1+3.9)=18.6×10=186 52.5x2.9+5.45=5.25x29+5.25+0.2=5.25×(29+1)+0.2=5.25×30+0.2=157.5+0.3=157.7 0.92x15+0.08x15=(0.92+0.08)×15=1×15=15 0.72×1.25×2.5=0.9×(0.8×1.25)×2.5=0.9×1×2.5=2.25 400.6x7-2003x0.4=200.3x14-200.3x4=200.3×（14-4）=200.3×10=2003 300÷125÷8 =300÷(125×8) =300÷1000 =0.3  396-96-172-28 =(396-96)-(172+28) =300-200 =100  125x24 =125x8x3 =1000x3 =3000 26x15 =(20+6)x15 =20x15+6x15 =300+90 =390  25x99x4 =25x4x99 =100x99 =9900  250x32 =250x4x8 =1000x8 =8000  (98+98+98+98)x25 =4x98x25 =4x25x98 =100x98 =9800 3/4÷5/8×3/10        =3/4×8/5×3/10=9/5×1/5=9/25 1.25×(8+10)=1.25×8+1.25×10=10+12.5=22.5 1.24+0.78+8.76=(1.24+8.76)+0.78=10+0.78=10.78 1/2-(4/5-1/2)=1/2+1/2-4/5=1-4/5=1/5 2/5-(3/8-3/5)=2/5+3/5-3/8=1-3/8=5/8 3/4-(3/7-1/4)=3/4+1/4-3/7=1-3/7=4/7 3.2x0.125x2.5=0.125x8x(0.4x2.5)=1x1=1 0.4×125×25×0.8=(0.4×25)×(125×0.8)=10×100=1000 1.25×(8+10)=1.25×8+1.25×10=10+12.5=22.5 9123-(123+8.8)=9123-123-8.8=9000-8.8=8991.2 1.24×8.3+8.3×1.76=8.3×(1.24+1.76)=8.3×3=24.9 9999×1001=9999×(1000+1)=9999×1000+9999×1=10008999 14.8×6.3-6.3×6.5+8.3×3.7=(14.8-6.5)×6.3+8.3×3.7=8.3×6.3+8.3×3.7=8.3×(6.3+3.7)=8.3×10=83 1.24+0.78+8.76=(1.24+8.76)+0.78=10+0.78=10.78 933-157-43=933-(157+43)=933-200=733 4821-998=4821-1000+2=3823 32×125×25=4×8×125×25=(4×25)×(8×125)=100×1000=100000 1.8+18÷1.5-0.5×0.3=1.8+12-0.15=13.8-0.15=13.65 6.5×8+3.5×8-47=52+28-47=80-47 3.7x2.56-2.3=9.472-2.3=7.172 1.24+0.78+8.76=(1.24+8.76)+0.78=10+0.78=10.78 1/2-(4/5-1/2)=1/2+1/2-4/5=1-4/5=1/5 4800÷25÷4=4800÷(25x4)=4800÷100=4800÷100=48 2/5-(3/8-3/5)=2/5+3/5-3/8=1-3/8=5/8 3/4-(3/7-1/4)=3/4+1/4-3/7=1-3/7=4/7 3.2x0.125x2.5=0.125x8x(0.4x2.5)=1x1=1 0.4×125×25×0.8=(0.4×25)×(125×0.8)=10×100=1000 9123-(123+8.8)=9123-123-8.8=9000-8.8=8991.2 1.24×8.3+8.3×1.76=8.3×(1.24+1.76)=8.3×3=24.9 9999×1001=9999×(1000+1)=9999×1000+9999×1=10008999 14.8×6.3-6.3×6.5+8.3×3.7=(14.8-6.5)×6.3+8.3×3.7=8.3×6.3+8.3×3.7=8.3×(6.3+3.7)=8.3×10=83 1.24+0.78+8.76=(1.24+8.76)+0.78=10+0.78=10.78 933-157-43=933-(157+43)=933-200=733 4821-998=4821-1000+2=3823 32×125×25=4×8×125×25=(4×25)×(8×125)=100×1000=100000 1.24+0.78+8.76=(1.24+8.76)+0.78=10+0.78=10.78 1/2-(4/5-1/2)=1/2+1/2-4/5=1-4/5=1/5 4800÷25÷4=4800÷(25x4)=4800÷100=4800÷100=48 2/5-(3/8-3/5)=2/5+3/5-3/8=1-3/8=5/8 3/4-(3/7-1/4)=3/4+1/4-3/7=1-3/7=4/7 3.2x0.125x2.5=0.125x8x(0.4x2.5)=1x1=1 0.4×125×25×0.8=(0.4×25)×(125×0.8)=10×100=1000 1.25×(8+10)=1.25×8+1.25×10=10+12.5=22.5 9123-(123+8.8)=9123-123-8.8=9000-8.8=8991.2 1.24×8.3+8.3×1.76=8.3×(1.24+1.76)=8.3×3=24.9 9999×1001=9999×(1000+1)=9999×1000+9999×1=10008999 14.8×6.3-6.3×6.5+8.3×3.7=(14.8-6.5)×6.3+8.3×3.7=8.3×6.3+8.3×3.7=8.3×(6.3+3.7)=8.3×10=83 1.24+0.78+8.76=(1.24+8.76)+0.78=10+0.78=10.78 933-157-43=933-(157+43)=933-200=733 4821-998=4821-1000+2=3823 32×125×25=4×8×125×25=(4×25)×(8×125)=100×1000=100000 1.8+18÷1.5-0.5×0.3=1.8+12-0.15=13.8-0.15=13.65 6.5×8+3.5×8-47=52+28-47=80-47 3.7x2.56-2.3=9.472-2.3=7.172 1.24+0.78+8.76=(1.24+8.76)+0.78=10+0.78=10.78 1/2-(4/5-1/2)=1/2+1/2-4/5=1-4/5=1/5 4800÷25÷4=4800÷(25x4)=4800÷100=4800÷100=48 2/5-(3/8-3/5)=2/5+3/5-3/8=1-3/8=5/8 3/4-(3/7-1/4)=3/4+1/4-3/7=1-3/7=4/7 3.2x0.125x2.5=0.125x8x(0.4x2.5)=1x1=1 0.4×125×25×0.8=(0.4×25)×(125×0.8)=10×100=1000 9123-(123+8.8)=9123-123-8.8=9000-8.8=8991.2 1.24×8.3+8.3×1.76=8.3×(1.24+1.76)=8.3×3=24.9 9999×1001=9999×(1000+1)=9999×1000+9999×1=10008999 14.8×6.3-6.3×6.5+8.3×3.7=(14.8-6.5)×6.3+8.3×3.7=8.3×6.3+8.3×3.7=8.3×(6.3+3.7)=8.3×10=83 1.24+0.78+8.76=(1.24+8.76)+0.78=10+0.78=10.78 933-157-43=933-(157+43)=933-200=733 4821-998=4821-1000+2=3823 32×125×25=4×8×125×25=(4×25)×(8×125)=100×1000=100000 1.8+18÷1.5-0.5×0.3=1.8+12-0.15=13.8-0.15=13.65 6.5×8+3.5×8-47=52+28-47=80-47=33 3.7x2.56-2.3=9.472-2.3=7.172 (25+2又5/21)×21/26=(26+26/21)x21/26=26x21/26+26/21x21/26=21+1=22 6/11×3/7+4/11×6/7=6/11x3/7+6/11x4/7=6/11x(3/7+4/7)=6/11x1=6/1145×2/3+1/3×45=45x(2/3+1/3)=45x1=45。

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