Kuchotsa manambala awiri, manambala atatu ndi manambala angapo ndi ndime

M'buku lino, tiwona malamulo ndi zitsanzo zothandiza za momwe manambala achilengedwe (madijiti awiri, manambala atatu, ndi manambala ambiri) angachotsedwe pamndandanda.

Malamulo Ochotsera

Kuti mupeze kusiyana pakati pa manambala awiri kapena angapo okhala ndi manambala aliwonse, mutha kutsitsa ndikuchotsa. Za ichi:

1. Lembani minuend pamzere wapamwamba kwambiri.
2. Pansi pake timalemba subtrahend yoyamba - mwanjira yakuti manambala omwewo a manambala onse awiri ali pansi pa wina ndi mzake (makumi pansi pa makumi, mazana pansi pa mazana, ndi zina zotero).
3. Momwemonso, timawonjezera ma subtrahends, ngati alipo. Zotsatira zake, mizati yokhala ndi manambala osiyanasiyana imapangidwa.
4. Jambulani mzere wopingasa pansi pa manambala olembedwa, omwe angalekanitse minuend ndi yochotsedwa kuchokera pakusiyana.
5. Tiyeni tipitirire pakuchotsa manambala. Njirayi imachitika kuchokera kumanja kupita kumanzere, padera pa ndime iliyonse, ndipo zotsatira zake zimalembedwa pansi pa mzere womwewo. Pali ma nuances angapo apa:
   • Ngati ziwerengero zomwe zili mu subtrahend sizingachotsedwe ku manambala muminuend, ndiye kuti timatenga khumi kuchokera pagulu lapamwamba, ndiyeno tiyenera kuganizira izi muzochita zina. (onani Chitsanzo 2).
   • Ngati minuend ndi ziro, izi zikutanthauza kuti kuti muchotse, muyenera kubwereka ku nambala yotsatira. (onani Chitsanzo 3).
   • Nthawi zina, chifukwa cha "ngongole", sipangakhale manambala omwe atsalira mu manambala apamwamba (onani Chitsanzo 4).
   • Nthawi zina, pakakhala ndalama zambiri zochotsera, zimafunika kuti musatenge chimodzi, koma khumi ndi awiri kapena kuposerapo nthawi imodzi. (onani Chitsanzo 5).

Zitsanzo Zochotsa Mzere

Mwachitsanzo 1

Chotsani 25 kuchokera pa 68.

Mwachitsanzo 2

Tiyeni tiwerenge kusiyana pakati pa manambala: 35 ndi 17.

Kufotokozera:

Popeza 5 sangathe kuchotsedwa pa nambala 7, timatenga XNUMX kuchokera pa nambala yofunika kwambiri. Zikukhalira 5 + = 10 15, 15-7 8 =. Ndipo musaiwale kuchotsa otanganidwa khumi m'gulu lolingana, mwachitsanzo 3-1=2-1=1.

Mwachitsanzo 3

Chotsani nambala 46 kuchokera pa 70.

Kufotokozera:

Chifukwa 6 sangathe kuchotsedwa pa ziro, timatenga khumi khumi. Chifukwa chake, 0 + = 10 10, 10-6 4 =. Ndiye ife kuganizira otanganidwa khumi pambuyo kuchotsa mu manambala lotsatira, mwachitsanzo 7-4-1 = 2.

Mwachitsanzo 4

Tiyeni tipeze kusiyana pakati pa manambala awiri ndi manambala atatu: 182 ndi 96.

Kufotokozera:

Kuchotsa 2 pa nambala 6 sikungagwire ntchito, choncho timatenga khumi. Timapeza 2 + = 10 12, 12-6 6 =. Zatsala pang'ono 8-1 7 =, koma 7 sangathe kuchotsedwa pa 9 mwina, kotero timabwereka khumi kuchokera mazana: 7 + = 10 17, 17-9 8 =. Motero, palibe chimene chimatsalira mu mazana okha, chifukwa 1-1 0 =.

Mwachitsanzo 5

Chotsani ku 1465 manambala 357, 214 ndi 78.

Kufotokozera:

Pankhaniyi, timachita zofanana ndi zitsanzo zam'mbuyomu. Kusiyana kokha ndiko kuti pochotsa muzambiri ndi mayunitsi, pamafunika kutenga osati imodzi, koma makumi awiri nthawi imodzi, mwachitsanzo. 5 + = 20 25, 25-7-4-8 = 6. Panthawi imodzimodziyo, idzakhalabe m'gulu la khumi 4 (6-2).