How he learn the spellling

Today, mother let him write on some exercise book since mother got it from Popular Bookstore promotion. After he finished writing the number in words suddenly the question mark flipped through mother's mind whether Ethan knows how to spell the words after he had written it?

Mother just simply asked him, can he spell the number one in word. He surprised mother. The mother continued to test him for the subsequent numbers in words. He amazed mother again. Mother asked is it that he learned to spell in the school ? Yes and he sang part of the number song to mother. Yup, he learned to spell the numbers in word through singing. Mother was pleased to know that the kindergarten teaches the kids to learn through playing game and singing a song.