小升初英语试题及答案
1、Didyouknow?Inthedecimalnumbersystem(base10)tendifferentdigits,0to9,areusedtowriteallthenumbers.Inthebinarynumbersystem(base2)twodifferentdigitsareused,i.e.0and1.Whichoneofthefollowingnumbersisnotavalidnumberinthe
octalnumbersystem(base8)?
A)128B)127C)126D)125E)124
2、Thenumberofdiagonalsthatcanbedrawninaregularpolygonwith
twentysides(icosagon)is_____.
3、Ifaandbareintegers,10??3=1,152??7=3,andthen379??6isequalto_____.
4、Twonumbersareintheratio2:3.When4isaddedtoeachnumbertheratiochangesto5:7.Thesumofthetwooriginalnumbersis____.
5、ThegreatestnumberofMondayswhichcanoccurin45consecutive
daysis____
6、Saulplaysavideogameinwhichhescores4forahitandlost6foramiss.After20roundshisscoreis30.Thenumberoftimeshehasmissedis____.
7、ThreegirlsA,BandCrunina100mrace.WhenAfinishes,Bis10m
behindAandwhenBfinishesCis20mbehindB.HowfarinmetreswasCfromAwhenAfinished?(Let’sassumealltheathletesrunataconstantspeed)
8、Theareasofthefacesofarectangulaboxare84cm2,70cm2and30cm2.Thevolumeoftheboxincm3is____.
9、Youhave3weights:1kg,3kgand9kgaswellasanequalarmbalance,asshown.Howmanydifferentweightobjectscanyouweighwiththesethree?
答案详见第二页
参考答案：
1、A考察我们学过的简单的进制问题，显然8进制中没有8出现
2、170找规律，公式为n×（n-3）÷2
3、1定义新运算，就是求379÷6的余数。
4、40，16和24
5、7
6、5
7、28米，根据距离比求出速度比，三者的速度比为1：9/10：18/25
8、420分解质因数
9、13种
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