About Sight Words
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Sight Words are commonly used words that young children are encouraged to memorize as a whole by sight.
Sight words account for a large percentage (up to 75%) of the words used in beginning children's print materials. The advantage for children being able to recognize sight words automatically is that a beginning reader will be able to identify the majority of words in a beginning text before they even attempt to read it; therefore, allowing the child to concentrate on meaning and comprehension as they read without having to stop and decode every single word.
Learn more about Sight Words: https://en.wikipedia.org/wiki/Sight_word