无限地循环下去。该小数是无限小数。Repeati
gdecimal循环小数Adecimalwhichrepeatsaseriesof
umbersforever无限重复的一组数字的小数Tosubtractdecimalsli
eupi
verticalformgiveeachdecimalthesame
umberofplacesa
dsubtractasusual
Simplerulesformultiplyi
gdecimals小数乘法的简单法则1Listi
verticalform2Multiplylikewhole
umbers3Puti
decimalplacebycou
ti
goverfromtherightthetotal
umberofdecimalspacesasi
thefactorsTomultiplyadecimalby1000movethedecimalpoi
ttotherightthreespacesthesame
umberofzerosi
1000
Rulesfordividi
gdecimals小数除法的法则1Ifthedivisorisadecimalmultiplythedivisora
dthedivide
dbythesamepowerof10tomakethedivisorawhole
umber若除数是个小数，它与被除数同时乘一个10的倍数，使两者都变为整数2dividelikewhole
umbers像整数一样相除Todivideby100movethedecimaltwospacestotheleftthesame
umberofzerosi
100Howdoyoufi
dtheAVERAGEorARITHMETICMEANofagroupof
umbers
910
f中国双语教育网资料
资料搜集：中国双语教育网信息中心
1Addallthe
umberstogether2Dividethesumbythequa
tityof
umbersyouaddedtogether
3、百分数Perce
tApartofawholeorapartof100
Thesymbolis“”a
dmea
s“dividedby100”Rewrite50asafractio
Rewritethefollowi
gasaperce
t13百分数用基数＋perce
t表示50％fiftyperce
t百分之五十3％threeperce
t百分之三012％zeropoi
to
etwoperce
t百分之零点一二这里的perce
t前半部per表示“每一”，ce
t这一后半部分表示“百”，所以百分之几中perce
t不用复数形式。amou
tperce
t×
umber分量百分比×总量Whatis10of306iswhatperce
tof242is60ofwhat
umber％perce
t百分之…‰permille千分之…Rateofi
teresti
terestrate利率Theperce
tagerateo
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i
theaccou
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terestSimplei
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terestthatispaidtoyoubasedo
yourpri
cipal（本金）o
ly百分数应用题：Perce
tproblemUsetheformulaprbptheperce
tage（百分数）rtheratei
decimal百分率bthebaseamou
t基数
1010
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