Tsim cov ntoo tsob ntoo yog txoj hauv kev yooj yim los nrhiav txhua tus lej tseem ceeb ntawm tus lej. Thaum koj paub yuav tsim tsob ntoo li cas, koj yuav tuaj yeem ua cov lej yooj yim dua, xws li nrhiav qhov loj tshaj plaws sib cuam tshuam (GCF) lossis tsawg kawg muaj ntau (LCM).
Kauj ruam
Txoj Kev 1 ntawm 3: Tsim Tsob Ntoo Tsob Ntoo
Kauj Ruam 1. Sau tus lej rau saum koj daim ntawv
Yog tias koj xav tsim tsob ntoo qhov tseem ceeb rau tus lej, pib los ntawm kev sau tus lej tshwj xeeb rau saum daim ntawv ua tus lej pib. Tus lej no yuav yog tsob ntoo saum toj kawg nkaus uas koj yuav tsim.
- Npaj ib qho chaw los sau qhov tseem ceeb los ntawm kev kos ob kab kab pheeb ces kaum hauv qab tus lej. Ib txoj kab nqes mus rau sab laug, thiab lwm txoj kab nqes mus rau sab xis.
- Xwb, koj tuaj yeem sau cov lej nyob hauv qab ntawm daim ntawv thiab tom qab ntawd kos kab raws li cov ceg rau cov xwm txheej. Txawm li cas los xij, txoj kev no tsis nquag siv.
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Piv txwv: Tsim cov ntoo ntoo rau tus lej 315.
- …..315
- …../…
Kauj Ruam 2. Nrhiav ob khub
Xaiv tus khub tus lej rau tus lej pib uas koj tab tom ua haujlwm. Yuav kom tsim nyog tau txais txiaj ntsig ua khub, cov lej lej no yuav tsum sib npaug tus lej thawj thaum lawv sib npaug.
- Ob yam no yuav tsim thawj ceg ntawm koj tsob ntoo.
- Koj tuaj yeem xaiv ob tus lej raws li yam vim tias qhov kawg yuav zoo ib yam txawm koj pib qhov twg los xij.
- Nco ntsoov tias tsis muaj ib yam zoo ib yam li tus lej qub thaum nws tau muab sib tw, lwm qhov tshaj yog tias qhov no thiab koj tus lej pib yog “1” thiab tus lej no yog tus lej tseem ceeb uas tsob ntoo tuaj yeem tsim tsis tau.
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Piv txwv:
- …..315
- …../…
- …5….63
Kauj Ruam 3. Txheeb cais txhua khub ntawm cov xwm txheej ntxiv kom tau txais lawv cov yam tseem ceeb
Piav thawj ob yam uas koj tau txais ua ntej kom txhua tus muaj ob yam.
- Raws li tau piav qhia ua ntej, ob tus lej tuaj yeem txiav txim siab yam yog tias lawv cov khoom sib npaug nrog tus lej uas lawv faib.
- Cov lej tseem ceeb tsis tas yuav muab faib ua ob pawg.
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Piv txwv:
- …..315
- …../…
- …5….63
- ………/
- …….7…9
Kauj Ruam 4. Rov ua cov kauj ruam saum toj no kom txog thaum koj tau txais tus lej tseem ceeb
Koj yuav tsum txuas ntxiv mus kom txog thaum qhov tshwm sim tsuas yog tus lej piv txwv li cov lej uas nws cov lej tsuas yog tus lej no thiab "1."
- Txuas ntxiv mus ntev li qhov tshwm sim tseem tuaj yeem faib los ntawm kev ua cov ceg tom ntej.
- Nco ntsoov tias tsis tuaj yeem muaj "1" hauv koj tsob ntoo.
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Piv txwv:
- …..315
- …../…
- …5….63
- ………/..
- …….7…9
- ………../..
- ……….3….3
Kauj Ruam 5. Txheeb xyuas txhua tus lej tseem ceeb
Vim tias cov xwm txheej no tshwm sim ntawm qib sib txawv hauv tsob ntoo, koj yuav tsum muaj peev xwm txheeb xyuas txhua tus lej tseem ceeb kom yooj yim mus nrhiav. Koj tuaj yeem xim, lub voj voog, lossis sau tus lej tseem ceeb uas twb muaj lawm.
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Piv txwv: Tus lej tseem ceeb uas yog yam ntawm 315 yog: 5, 7, 3, 3
- …..315
- …../…
- Kauj ruam 5.….63
- …………/..
-
………
Kauj ruam 7.…9
- …………../..
-
………..
Kauj ruam 3
Kauj ruam 3.
- Lwm txoj hauv kev los sau thawj qhov tseem ceeb ntawm tsob ntoo tseem ceeb yog sau tus lej no hauv qib tom ntej hauv qab no. Thaum kawg ntawm kev daws teeb meem, koj tuaj yeem pom txhua qhov tseem ceeb no vim tias lawv txhua tus yuav nyob hauv kab hauv qab.
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Piv txwv:
- …..315
- …../…
- ….5….63
- …/……/..
- ..5….7…9
- ../…./…./..
- 5….7…3….3
Kauj Ruam 6. Sau cov tseem ceeb hauv daim ntawv ua zauv
Sau txhua yam tseem ceeb uas koj tau txais - los ntawm cov teeb meem koj tau daws - hauv daim ntawv sib npaug. Sau txhua qhov tseem ceeb los ntawm kev sau lub sij hawm nruab nrab ntawm ob tus lej.
- Yog tias koj raug nug kom muab lus teb nyob rau hauv daim ntawv ntawm tsob ntoo zoo, koj tsis tas yuav ua cov theem hauv qab no.
- Piv txwv: 5 x 7 x 3 x 3
Kauj Ruam 7. Txheeb xyuas koj cov qhab nias sib npaug
Daws qhov zauv uas koj nyuam qhuav sau. Tom qab koj tau suav txhua qhov tseem ceeb, qhov tshwm sim yuav tsum zoo ib yam li thawj tus lej.
Piv txwv: 5 x 7 x 3 x 3 = 315
Txoj Kev 2 ntawm 3: Txiav Txim Siab Qhov Zoo Tshaj Plaws (GCF)
Kauj Ruam 1. Tsim tsob ntoo qhov tseem ceeb rau txhua tus lej pib teev tseg hauv qhov teeb meem
Txhawm rau suav qhov loj tshaj qhov sib txawv (GCF) ntawm ob lossis ntau tus lej, pib los ntawm kev rhuav tshem txhua tus lej thawj rau hauv qhov tseem ceeb. Koj tuaj yeem siv tsob ntoo cog rau qhov kev suav no.
- Tsim cov ntoo ntoo rau txhua tus lej pib.
- Cov kauj ruam xav tau los tsim cov ntoo ntoo ntawm no yog tib yam li cov tau piav qhia hauv ntu "Tsim Tsob Ntoo Tsob Ntoo."
- GCF ntawm ob lossis ntau tus lej yog qhov loj tshaj tau los ntawm cov txiaj ntsig ntawm kev faib cov lej thawj zaug uas tau txiav txim siab hauv qhov teeb meem. FPB yuav tsum faib tag nrho cov lej pib hauv qhov teeb meem.
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Piv txwv: Xam GCF ntawm 195 thiab 260.
- ……195
- ……/….
- ….5….39
- ………/….
- …….3…..13
- Qhov tseem ceeb ntawm 195 yog: 3, 5, 13
- …….260
- ……./…..
- ….10…..26
- …/…\ …/..
- .2….5…2…13
- Qhov tseem ceeb ntawm 260 yog: 2, 2, 5, 13
Kauj Ruam 2. Nrhiav qhov feem ntau ntawm ob tus lej no
Ua tibzoo saib ntawm txhua tsob ntoo uas koj tau tsim rau txhua tus lej pib. Txiav txim siab qhov tseem ceeb rau txhua tus lej thawj, tom qab ntawd xim lossis sau txhua yam zoo ib yam.
- Yog tias tsis muaj ib qho xwm txheej zoo ib yam los ntawm ob tus lej pib, nws txhais tau tias GCF ntawm ob tus lej no yog 1.
- Piv txwv: Raws li tau piav qhia ua ntej, qhov tseem ceeb ntawm 195 yog 3, 5, thiab 13; thiab qhov tseem ceeb ntawm 260 yog 2, 2, 5, thiab 13. Yam sib xws ntawm ob tus lej no yog 5 thiab 13.
Kauj Ruam 3. Muab cov zauv los sib npaug
Yog tias muaj ob lossis ntau tus lej uas yog tib yam ntawm ob tus lej no, koj yuav tsum muab txhua yam sib koom ua ke kom tau GCF.
- Yog tias tsuas muaj ib qho xwm txheej ntawm ob lossis tus lej ua ntej, GCF ntawm cov lej pib no yog qhov no.
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Piv txwv: Feem ntau ntawm cov lej 195 thiab 260 yog 5 thiab 13. Cov khoom ntawm 5 zaug 13 yog 65.
5 x 13 = 65 po
Kauj Ruam 4. Sau koj cov lus teb
Tam sim no lo lus nug no tau teb, thiab koj tuaj yeem sau qhov txiaj ntsig kawg.
- Koj tuaj yeem tshawb xyuas koj li haujlwm ob zaug, yog tias tsim nyog, los ntawm kev faib txhua tus lej thawj los ntawm GCF uas koj tau txais. Koj qhov kev suav suav raug yog tias txhua tus lej xub tau faib los ntawm GCF.
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Piv txwv: GCF ntawm 195 thiab 260 yog 65.
- 195 / 65 = 3
- 260 / 65 = 4
Txoj Kev 3 ntawm 3: Txiav Txim Qhov Tsawg Feem Ntau (LCM)
Kauj Ruam 1. Ua ib tsob ntoo ntawm txhua tus lej xub muab rau hauv qhov teeb meem
Txhawm rau nrhiav qhov tsawg tshaj plaws sib txawv (LCM) ntawm ob lossis ntau tus lej, koj yuav tsum decompose txhua tus lej pib hauv qhov teeb meem mus rau qhov tseem ceeb. Ua cov laij lej no siv tsob ntoo tsob ntoo.
- Tsim cov ntoo ntoo rau txhua tus lej pib hauv qhov teeb meem raws li cov lus piav qhia hauv ntu "Tsim Tsob Ntoo Tsob Ntoo."
- Ntau yam txhais tau tias tus lej uas yog ib feem ntawm thawj tus lej muab. LCM yog tus lej tsawg tshaj plaws uas yog tib tus lej ntawm txhua tus lej pib hauv qhov teeb meem.
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Piv txwv: Nrhiav LCM ntawm 15 thiab 40.
- ….15
- …./..
- …3…5
- Qhov tseem ceeb ntawm 15 yog 3 thiab 5.
- …..40
- …./…
- …5….8
- ……../..
- …….2…4
- …………/
- ……….2…2
- Qhov tseem ceeb ntawm 40 yog 5, 2, 2, thiab 2.
Kauj Ruam 2. Txiav txim xyuas yam sib xws
Nco tseg txhua qhov tseem ceeb ntawm txhua tus lej pib. Xim nws, sau nws, lossis yog tias tsis yog, nrhiav txhua yam xwm txheej uas tshwm sim hauv txhua tsob ntoo ntoo.
- Nco ntsoov yog tias koj tab tom ua haujlwm nrog teeb meem nrog ntau dua ob lub ntsiab lus pib, tib yam yuav tsum muaj nyob hauv tsawg kawg yog ob ntawm cov ntoo ntoo, tab sis tsis tas yuav nyob hauv txhua yam ntoo.
- Sib piv cov xwm txheej ua ke. Piv txwv, yog tias ib tus lej pib muaj ob yam tseem ceeb ntawm "2" thiab lwm tus lej pib muaj ib qho ntawm "2," koj yuav tsum suav tus lej "2" ua khub; thiab lwm qhov "2" raws li tus lej tsis sib xws.
- Piv txwv: Yam 15 yog 3 thiab 5; cov xwm txheej ntawm 40 yog 2, 2, 2, thiab 5. Ntawm cov no, tsuas yog 5 tshwm sim raws li qhov tshwm sim ntawm ob tus lej pib no.
Kauj Ruam 3. Muab tus lej ua ke los ntawm qhov tsis sib thooj
Tom qab koj cais cov xwm txheej ua ke, muab qhov sib npaug no los ntawm txhua qhov tsis sib xws hauv txhua tsob ntoo.
- Cov xwm txheej ua ke tau suav tias yog ib qho tseem ceeb, thaum tsis muaj qhov sib txawv yuav tsum raug coj mus rau hauv tus account tag nrho, txawm tias qhov xwm txheej no tshwm sim ntau zaus hauv cov ntoo ntoo ntawm thawj tus lej.
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Piv txwv: Qhov ua khub yog 5. Tus lej pib 15 kuj tseem muaj qhov tsis sib xws ntawm 3, thiab tus lej pib 40 kuj tseem muaj qhov tsis sib thooj ntawm 2, 2, thiab 2. Yog li koj yuav tsum muab sib ntxiv:
5 x 3 x 2 x 2 x 2 = 120
Kauj Ruam 4. Sau koj cov lus teb
Qhov teeb meem tau teb, thiab tam sim no koj tuaj yeem sau qhov kawg.
