U\u010denie sa n\u00e1sobi\u0165 je pre deti (a rodi\u010dov) \u010dasto skuto\u010dnou v\u00fdzvou, ale existuje star\u00e1, neuverite\u013ene vizu\u00e1lna a d\u00f4myseln\u00e1 met\u00f3da, ktor\u00e1 rob\u00ed matematiku z\u00e1bavnou. Naz\u00fdva sa n\u00e1sobenie s\u010d\u00edtan\u00edm, \u010dasto ozna\u010dovan\u00e9 ako japonsk\u00e1 alebo \u010d\u00ednska met\u00f3da.<\/p>\n\n\n\n
Kr\u00e1sa spo\u010d\u00edva v tom, \u017ee die\u0165a si nemus\u00ed zapam\u00e4ta\u0165 ani jednu n\u00e1sobilku \u2013 sta\u010d\u00ed nakresli\u0165 \u010diary a po\u010d\u00edta\u0165 bodky!<\/p>\n\n\n\n
Tu je postup, ako tento trik funguje krok za krokom (napr\u00edklad pre 12 \u00d7 13):<\/p>\n\n\n\n
Krok 1: Nakreslite prv\u00e9 \u010d\u00edslo. Nakreslite priamky diagon\u00e1lne nadol z\u013eava doprava.<\/p>\n\n\n\n
Prv\u00e1 \u010d\u00edslica \u010d\u00edsla 12 je 1: Nakreslite nad \u0148u \u010diaru.<\/p>\n\n\n\n
Druh\u00e1 \u010d\u00edslica je 2: Nechajte trochu miesta a nakreslite pod \u0148u dve \u010diary rovnobe\u017ene s prvou.<\/p>\n\n\n\n
Krok 2: Prienik s druh\u00fdm \u010d\u00edslom
Teraz nakreslite \u010diary z opa\u010dn\u00e9ho smeru (z\u013eava doprava, zhora nadol), ktor\u00e9 sa pret\u00ednaj\u00fa s predch\u00e1dzaj\u00facimi \u010diarami.<\/p>\n\n\n\n
Prv\u00e1 \u010d\u00edslica \u010d\u00edsla 13 je 1: Nakreslite 1 \u010diaru do\u013eava.<\/p>\n\n\n\n
Druh\u00e1 \u010d\u00edslica je 3: Nechajte medzeru a nakreslite 3 \u010diary doprava.<\/p>\n\n\n\n
Krok 3: Spo\u010d\u00edtajte priese\u010dn\u00edky!<\/p>\n\n\n\n
V duchu rozde\u013ete v\u00fdsledn\u00fd obr\u00e1zok (alebo nakreslite zvisl\u00e9 \u010diary) na tri \u010dasti: \u013eav\u00fd, stredn\u00fd a prav\u00fd priese\u010dn\u00edk. Teraz spo\u010d\u00edtajte priese\u010dn\u00edky \u010diar:<\/p>\n\n\n\n
Prav\u00e1 strana (jednotky): Priese\u010dn\u00edky 2 spodn\u00fdch \u010diar a 3 prav\u00fdch \u010diar ved\u00fa k \u2192 6 priese\u010dn\u00edkom.<\/p>\n\n\n\n
Stredn\u00e1 strana (desiatky): S\u010d\u00edtajte body v strede. Hore s\u00fa 3 a dole 2 \u2192 3 + 2 = 5 priese\u010dn\u00edkov.<\/p>\n\n\n\n
\u013dav\u00e1 strana (stovky): Priese\u010dn\u00edky 1 hornej \u010diary a 1 \u013eavej \u010diary ved\u00fa k \u2192 1 priese\u010dn\u00edku.<\/p>\n\n\n\n
Kone\u010dn\u00fd v\u00fdsledok<\/p>\n\n\n\n
Pre\u010d\u00edtajte si \u010d\u00edsla z\u013eava doprava: 1, 5, 6.<\/p>\n\n\n\n
V\u00fdsledok: 156!<\/p>\n\n\n\n
Pre\u010do to funguje tak dobre?<\/p>\n\n\n\n
Deti miluj\u00fa hmatate\u013en\u00e9 veci. Tento trik rob\u00ed n\u00e1sobenie jasn\u00fdm a nie len abstraktn\u00fdm. Poskytuje pocit \u00faspechu, podnecuje nad\u0161enie pre matematiku a pom\u00e1ha de\u0165om pochopi\u0165, \u017ee n\u00e1sobenie je v podstate o opakuj\u00facich sa skupin\u00e1ch.<\/p>\n\n\n\n
(Pozn\u00e1mka: Ak je s\u00fa\u010det priese\u010dn\u00edkov dvojcifern\u00e9 \u010d\u00edslo \u2013 napr\u00edklad 12 \u2013 postupujeme ako pri p\u00edsomnom s\u010d\u00edtan\u00ed: Zap\u00ed\u0161eme 2 a 1 prenesieme do \u010fal\u0161ieho st\u013apca.)<\/p>\n","protected":false},"excerpt":{"rendered":"
U\u010denie sa n\u00e1sobi\u0165 je pre deti (a rodi\u010dov) \u010dasto skuto\u010dnou v\u00fdzvou, ale existuje star\u00e1, neuverite\u013ene vizu\u00e1lna a d\u00f4myseln\u00e1 met\u00f3da, ktor\u00e1 rob\u00ed matematiku z\u00e1bavnou. Naz\u00fdva sa n\u00e1sobenie s\u010d\u00edtan\u00edm, \u010dasto ozna\u010dovan\u00e9 ako […]<\/p>\n","protected":false},"author":2,"featured_media":3198,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"class_list":["post-3197","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-zivotne-triky"],"_links":{"self":[{"href":"https:\/\/www.sk-babickinerady.top\/index.php?rest_route=\/wp\/v2\/posts\/3197"}],"collection":[{"href":"https:\/\/www.sk-babickinerady.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.sk-babickinerady.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.sk-babickinerady.top\/index.php?rest_route=\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.sk-babickinerady.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=3197"}],"version-history":[{"count":1,"href":"https:\/\/www.sk-babickinerady.top\/index.php?rest_route=\/wp\/v2\/posts\/3197\/revisions"}],"predecessor-version":[{"id":3199,"href":"https:\/\/www.sk-babickinerady.top\/index.php?rest_route=\/wp\/v2\/posts\/3197\/revisions\/3199"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.sk-babickinerady.top\/index.php?rest_route=\/wp\/v2\/media\/3198"}],"wp:attachment":[{"href":"https:\/\/www.sk-babickinerady.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=3197"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.sk-babickinerady.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=3197"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.sk-babickinerady.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=3197"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}