Why fairy tales work
The vocabulary of fairy tales is the vocabulary of childhood: animals, food, family, forests, kings, princesses, simple actions. Around 500 common words give you 80 percent of what is on the page. The grammar is mostly past simple. Sentences are short.
This is the same input a native child receives. For an adult learner, it lets you read full stories from your first week, instead of textbook exercises about what colour the pencil is.
How many words you need
Studies of extensive reading, that is reading a lot of easy material rather than studying a little difficult material, find measurable gains in reading speed, comprehension and word recognition somewhere between 30,000 and 50,000 words. In one study of Japanese college learners, around 50,000 words was the point at which extensive reading matched conventional classroom teaching (Iwata, Reading Matrix, 2020).
What those studies do not say is that a word count makes you A2. A CEFR level covers speaking, listening and writing as well, and reading volume alone does not decide it. What the volume buys you is the reading itself: words you recognise without stopping, sentences you take in at a glance.
Oxford University Press puts the principle plainly: read a lot, and read at a level where only three or four words on a page are new to you. That is how these shelves are built, and it is why the stories start at a hundred and fifty words rather than a thousand. About extensive reading, Oxford University Press →
This plan covers about 27,200 words, bringing you close to that threshold. The first seven folk tales that follow add another 10,288 words, bringing the total to about 37,488 — comfortably within the range. Reading the whole shelf takes you even further.