parimeya sankhya

yadi kisi vaastavik sankhya ko do poorn sankhyaaon ke anupaat ke roop mein vyakt kiya ja sakta hai to use parimeya sankhya (Rational number) kehte hain. arthaat koi sankhya , jahaaain a aur b donon poorn sankhyaaen hain aur jahaaain , ek parimeya sankhya hai. 1, 2.5, 3/5, 0.7 aadi parimeya sankhyaaon ke kuchh udaaharan hain.

parimeya sankhya se sambandhit prameya- yadi x ek parimeya sankhya hai jiska dashamalaveeya vistaar saant (terminating) hai. tab x ko p bata q ke roop mein likha ja sakta hai, jahaaain p tatha q asahabhaajya sankhyaaeain hain tatha q ka avibhaajya gunan khand 2-ghaat-n gune 5-ghaat-m ke roop mein hai jahaaain n aur m gair-rinaatmak poornaank hain.

jo vaastavik sankhyaaen parimeya naheen hoteen, unhein aparimeya sankhya (Irrational number) kehte hain; jaise √a2, pai, e (praakrutik laghuganak ka aadhaar), 8 ka ghanamool aadi.