Disclosed herein, a new concept of numeral created from alphabet is able to apply in education, telecommunication, computer and toy industry. For the sake of applicability, the present invention provides substitution methods where alphabet is replaced to the corresponding arabic numeral by similarity in shape, similar pronunciation with numbers, similarity in Roman and Chinese. In education, alphabetic language (English, French, Spanish) learners can calculate words and sentences in mathematics (abacus calculation, mental arithmetic, calculation), and learn words and sentences of languages in detail. Math (abacus calculation, mental arithmetic, calculation) learners can study alphabetic languages (English, French, Spanish) not in a tedious repetition of calculation but in a mathematical learning process. In telecommunication and computer industry, for instant input of letters, the alphabet letters are arranged to the corresponding numeral keys by similarity between alphabet and arabic numeral, and the number key, which reminds letters, is pushed designated times to input accordingly. In toy industry, diverse educational toys can be manufactured to learn substitution methods proposed in the disclosed herein.