An koyar da mu don samun adadin adadin a makaranta, amma a kan lokaci, da yawa manya ke da wannan mahimmancin fasaha ya ɓace. Koyaya, lokacin da kuke ƙoƙarin ƙididdige girman ragin a cikin shagon ko tantance adadin kuɗin da ke buƙatar yin mafarki don hutu, zaku buƙaci tsarin ilimin lissafi na dama.
"Aauki kuma ku yi" zai nuna muku hanyoyi da yawa don lissafta adadin adadin da za'a iya amfani dashi a yanayi daban-daban.
1. Yadda ake samun kashi ɗaya daga cikin
Ka'idar asali
Idan kana son lissafta adadin kowane lamba, ya kamata ka yi amfani da tsari na procula p% * x = a ina:
- P% shine kashi;
- X - lamba;
- Y - amsar karshe.
Misali, kuna buƙatar ƙidaya kuɗin kuɗin da zaku iya ceta, sayen wayar hannu, wanda ke kashe $ 250, tare da ragin 20%.
- A wannan yanayin, daidaiton zai zama kamar haka: 20% * 250 = y.
- Don samar da lissafin lissafi, kuna buƙatar canza 20% a cikin yanki mai narkewa. Kawai raba lamba 100 kuma cire alamar kashi.
- Canza daidaituwa: 0.2 * 250 = y.
- Yana lissafta: 0.2 * 250 = 50. Amsa: Y = 50.
Siyan wayar hannu tare da rangwame na 20%, za ku adana $ 50.
Madadin hanya
Akwai wata hanyar da za a lissafta yawan wanda zai iya zama da amfani yayin da baka da kalkuleta a hannu, amma ba shi da sauƙi a warware daidaituwa a hannu. Ka sake cewa ka sake bukatar gano abin da kashi 20% na 250.
- Don yin wannan, zaku iya ninka lambobi, faɗaɗa zeros: 2 * 25 = 50.
- Sannan kuna buƙatar fahimtar abin da za ku yi tare da zeros cewa ba ku yi la'akari ba lokacin ninka lambobi. Don haka, a amsa na iya zama 50; 0.5 ko 500.
- Daga cikin lambobi 2 na ƙarshe, ɗaya ya yi ƙanana, ɗayan yana da girma idan aka kwatanta da 250. Ba shi yiwuwa cewa 04. Saboda haka, amsar da ta dace: 50.
Idan kuna ma'amala da ƙarin lambobi masu rikitarwa, zaku iya canza wannan hanyar dan kadan. A ce kuna buƙatar lissafta 34% na 45.
- Yada 34% da 30% da 4%.
- An samo daidaituwa a cikin irin wannan: (30% + 4%) * 45.
- Yi la'akari: (30% + 4%) * 45 = 13.5 + 1.8 = 15.3.
Amsa: 15.3. Wani misalin ana lissafta 40% na 154.
- Fara da bazuwar 154 a 150 da 4.
- Don haka, daidaituwa zai zama kamar haka: 40% * (150 + 4).
- Yana lissafta: 40% * (150 + 4) = 60 + 6,6 = 61.6.
Amsa: 61.6.
2. Yadda ake lissafta kashi ɗaya cikin kashi ɗaya daga ƙari
Idan kana buƙatar lissafta, ɗayan adadin wani adadi daga adadi mafi girma, kuna buƙatar amfani da tsarin Y / X = P%. Misali, a ce na ranar haihuwar dala 80 da aka gabatar a kan ranar haihuwar $ 80 kuma yanzu kana son lissafta da adadin adadin da kuka riga kuka ciyar.
- A wannan yanayin, y = 20, x = 80.
- An samo daidaituwa kamar haka: 20/80 = p%.
- Lissafta: 20/80 = 0.25.
- Sannan kuna buƙatar sauya kashi mai narkewa cikin ban sha'awa. Don yin wannan, ninka lambar da aka samu a cikin 100.
- Saboda haka, 0.25 * 100 = 25%. Amsa: 25%.
Don haka kun kashe kashi 25% na $ 80 da aka bayar.
3. Yadda za a tantance lambar idan ka san abin da yake daidai da adadin sa
Idan kana buƙatar lissafta wani lamba, idan aka lura da cewa kun san abin da yake daidai da adadin sa, kuna buƙatar amfani da ƙirar Y / PILTION = X., kun ga talla wanda zaku adana $ 40, cewa shine, kashi 20% na jimlar tafiya zuwa karshen mako, idan kun yi shi nan da nan. Kuna da sha'awar koyan jimlar farashin tafiya. Tun lokacin da sanarwar ba ta ce komai game da wannan ba, ka yanke shawarar lissafa shi da kanka.
- A wannan yanayin, y = 40, p% = 20%, da x ba a sani ba.
- An samo daidaituwa kamar haka: 40/20% = X.
- Kashe 20% a cikin kashi mai narkewa: 20/100 = 0.2.
- Haɗin zai zama kamar wannan: 40 / 0.2 = x.
- Yi la'akari: 40 / 0,2 = 200. Amsa: 200.
Jimlar kudin tafiya shine $ 200.