A basic tool that shows you the percentage of words on the page are Dolch Sight Words. Dolch Sight Words are the most commonly used set of sight words. Educator Dr. Edward William Dolch developed the list in the 1930s-40s by studying the most frequently occurring words in children's books of that era. The list contains 220 “service words” plus 95 high-frequency nouns.
More information at: samsonsclassroom.com
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