Malamulo: momwe mungayendetsere nambala mpaka hundredths

Mu masamu, kuzungulira kumatanthawuza opaleshoni yomwe imakulolani kuti muchepetse chiwerengero cha zilembo mu chiwerengero mwa kuziyika, ndikupatsa malamulo ena. Ngati mukufuna kudziwa momwe mungayendetsere nambalayi kufika pa zana, ndiye choyamba muyenera kumvetsetsa malamulo omwe alipo. Pali njira zingapo zomwe mungasinthire manambala:

1. Chiwerengero - chimagwiritsidwa ntchito poyesa chiwerengero cha anthu a mumzindawo. Kulankhula za chiŵerengero cha nzika, amangoti ndi mtengo wapatali, osati chiwerengero chenicheni.
2. Kuthamanga kwa theka la hafu kumachitika kufupi kwambiri ngakhale nambala.
3. Kuzungulira mpaka chiwerengero chaching'ono (kuzungulira ku zero) ndizowona zosavuta, pamene zonse "zowonjezera" zimatayidwa.
4. Kuzungulira mpaka chiwerengero chachikulu - ngati zizindikiro zomwe mukufuna kuzungulira sizili zofanana ndi zero, ndiye nambalayo yatha. Njira imeneyi imagwiritsidwa ntchito ndi ogwira ntchito kapena opaleshoni zamagetsi.
5. Zosagwirizana ndi zero - manambala akuzungulira malinga ndi malamulo onse, koma pamene zotsatira ziyenera kukhala 0, kuzungulira kwachitika "kuchokera ku zero".
6. Kuzungulira kwinakwake - pamene N + 1 ndi ofanana ndi 5, nambalayo imakhala yozungulira, kenaka ndi yaying'ono, kenako kumbali yayikuru.

Mwachitsanzo, muyenera kuzungulira nambala 21,837 kupita kufupi ndi zana. Mukatha kuzungulira, yankho lanu lolondola liyenera kukhala 21.84. Tiyeni tifotokoze chifukwa chake. Chiwerengero chachisanu ndi chitatu chikuphatikizidwa mu chiwerengero cha khumi, choncho, 3 mu gulu la hundredths, ndi 7 - thousandth. 7 ndiposa 5, kotero timakweza 3 ndi 1, ndiko kuti, mpaka 4. Izi ndi zophweka ngati mukudziwa malamulo ochepa:

1. Nambala yotsiriza yomasulidwa ikuwonjezeka ndi imodzi ngati yoyamba yonyaluka ndi yayikulu kuposa 5. Ngati nambalayi ili yofanana ndi 5 ndipo pali ziwerengero zina za izo, ndiye chiwerengero choyambanso chikuwonjezeredwa ndi 1.

Mwachitsanzo, tifunikira kuti tifike mpaka chakhumi: 54,69 = 54,7, kapena 7,357 = 7,4.

Ngati mutapemphedwa momwe mungagwirire mpaka mazana angapo, chitani monga momwe tawonetsera pamwambapa.

2. Nambala yosungidwa yosasintha siinasinthe ngati yoyamba ikutayidwa, yomwe ilipo isanakwane 5.

Chitsanzo: 96.71 = 96.7.

3. Chotsatira cha mawerengedwe osungidwa sichikhala chosasinthika, malinga ngati icho chiri, ndipo ngati choyamba chotsala ndicho nambala 5, ndipo palibe ziwerengero zina kumbuyo kwake. Ngati nambalayi ndi yosamvetseka, ikuwonjezeka ndi 1.

Zitsanzo: 84.45 = 84.4 kapena 63.75 = 63.8.

Zindikirani: M'masukulu ambiri, ophunzira amapatsidwa malamulo omveka bwino, choncho ndizofunika kuziganizira izi. Mwa iwo, nambala zonse sizikhala zosasintha, ngati zitatha izo zimakhala nambala kuyambira 0 mpaka 4 ndipo zikuwonjezeka ndi 1, kupatula kuti chiwerengerocho chikhalapo kuyambira 5 mpaka 9. Mosamala kuthetsa mavuto ndi kutsata malamulo okhwima, koma ngati sukuluyi ndi yosavuta, ndiye Pofuna kupewa kusamvetsetsa, ndibwino kuti tigonjetsedwe. Tikuyembekeza kuti mumamvetsetsa momwe mungagwirire nambalayi mpaka hundredths.

Kuzungulira mmoyo ndikofunikira kuti mukhale ndi mwayi wogwira ntchito ndi manambala ndikuwonetsa kulondola kwa miyeso. Pakadali pano, kutanthauzira koteroko kwotsutsana ndi kuzungulira kwawonekera. Mwachitsanzo, powerengera mavoti a phunziro, nambala zowerengeka zimaonedwa kuti ndizolakwika. Masitolo amagwiritsanso ntchito kutsutsana kuti apange mtengo wabwino kwa ogula (mwachitsanzo, akulemba 199, osati 200). Tikuyembekeza kuti funso la momwe mungagwiritsire ntchito nambalayi mpaka zana kapena khumi, tsopano mukhoza kudziyankha nokha.