小学数学---熟记常见数据

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1、...常用分数、小数的互化12=0.5=50℅14=0.25=25℅34=0.75=75℅15=0.2=20℅25=0.4=40℅35=0.6=60℅45=0.8=80℅18=0.125=12.5℅38=0.375=37.5℅58=0.625=62.5℅78=0.875=87.5℅120=0.05320=0.151......720=0.35920=0.451120=0.551320=0.651720=0.851920=0.95116=0.0625132=0.03125164=0.0156251128=0.0078

2、1251256=0.003906251512=0.00195312511024=0.000976562513≈0.33323≈0.66716≈0.16756≈0.8332......17=0.142857142857142857⋯⋯≈0.14327=0.285714285714285714⋯⋯≈0.28637=0.428571428571428571⋯⋯≈0.42947=0.571428571428571428⋯⋯≈0.57157=0.714285714285714285⋯⋯≈0.71467=0.857142857

3、142857142⋯⋯≈0.857熟记：142857常用圆周率的计算3.14×1=3.143.14×2=6.283.14×3=9.423.14×4=12.563.14×5=15.703.14×6=18.843.14×7=21.983.14×8=25.123......3.14×9=28.263.14×12=37.683.14×16=50.243.14×18=56.523.14×20=62.803.14×25=78.503.14×32=100.483.14×36=113.043.14×49=153.863.14×64

4、=200.963.14×81=254.343.14×121=379.94常用的平方数12=122=122=432=942=942=1652=2562=2562=3672=4982=4982=6492=81102=81102=100112=121122=121122=144132=169142=169142=196152=225162=225162=256172=289182=289182=324192=361202=361202=400常用的立方数......13=123=123=833=2743=6453=645

5、3=12563=21673=34383=34383=51293=7294......103=1000113=1000113=1331123=1728133=2197143=2197143=2744153=3375163=4096173=4913183=5832193=6859203=8000约分时常用的乘法算式11×2=2212×2=2412×3=3612×4=4812×5=6012×6=7212×7=8412×8=9613×2=2613×3=3913×4=5213×5=6513×6=7813×7=9114×2=2

6、814×3=4214×4=5614×5=7014×6=8414×7=9815×2=3015×3=4515×4=6015×5=7515×6=9016×2=3216×3=4816×4=6416×5=8016×6=9617×2=3417×3=5117×4=6817×5=8518×2=3618×3=5418×4=7218×5=9019×2=3819×3=5719×4=7619×5=9521×2=4221×3=6321×4=84......21×5=10521×6=12621×7=1475......22×2=4422×3=

7、6622×4=8822×5=11023×2=4623×3=6923×4=9223×5=11524×2=4824×3=7224×4=9624×5=12025×2=5025×3=7525×4=10025×5=12525×6=15026×2=5226×3=7827×2=5427×3=8128×2=5628×3=8428×4=11228×5=14029×2=5829×3=8731×2=6231×3=9332×2=6432×3=9634×2=8634×3=10235×2=7035×3=10536×2=7237×2=7438×

8、2=7639×2=7841×2=8442×2=8443×2=8645×2=9046×2=9247×2=9448×2=9649×2=9851×2=10252×2=5452×3=15653×2=10653×3=15954×2=10854×3=16255×2=110125×8=100037×3=11137×4=14837×5=18537×6=222长度单位换算1千