Phoneme Change Activity from the Florida Center of Reading Research - https://fcrr.org/sites/g/files/upcbnu2836/files/media/PDFs/student_center_activities/23_phoneme_manipulating/23_pa023_phoneme_swap.pdf
Word Concentration - Practice Reading Words - Activity from the Florida Center of Reading Research - https://fcrr.org/sites/g/files/upcbnu2836/files/media/PDFs/student_center_activities/23_high_frequency_words/23_p009_word_concentration.pdf
Jumping Words - Practice Reading words - Activity from the Florida Center of Reading Research - https://fcrr.org/sites/g/files/upcbnu2836/files/media/PDFs/student_center_activities/23_high_frequency_words/23_p008_jumping_words.pdf
Fluency and Accuracy Practice - Activity from the Florida Center of Reading Research - https://fcrr.org/sites/g/files/upcbnu2836/files/media/PDFs/student_center_activities/23_fluency_phrases/23_f014_phrase_speed_practice.pdf
Third Grade Dolch Sight Word List
You can make flashcards to have them practice knowing these words automatically to make their reading more fluent. If your kiddo masters these look on the grades above for more lists:-). https://sightwords.com/pdfs/word_lists/dolch_3rd.pdf
All Dolch Word List -https://sightwords.com/pdfs/word_lists/dolch_group.pdf
Common Prefixes and Suffixes - It can help when decoding larger words to know how to read the prefix and suffix and to know their meaning - https://www.scholastic.com/content/dam/teachers/lesson-plans/migrated-files-in-body/prefixes_suffixes.pdf
Sight Word Drills - Do these drills to help make the sight words automatic so that when they are reading they don't have to take time to think about these words and focus on larger and decodable words.