Free vowel digraph worksheets are available at BogglesWorldESL.com, FunFonix.com and PrintableWorksheets.in, as of 2015. BogglesWorldESL.com offers worksheets aimed at younger learners that include basic tracing, writing and reading exercises. Each worksheet focuses on a different word, with multiple worksheets available for each digraph. The worksheets at FunFonix.com are taken from the printable Fun Fonix Book 4 workbook. The exercises are more varied and more advanced; they include identifying long and short vowel sounds, spelling tests and basic reading comprehension.
The worksheets at PrintableWorksheets.in are curated from various online sources and in the form of printable PDF files. Some of the exercises on the sheets are similar to those available at the other websites, such as filling in missing digraphs and identifying words. More advanced worksheets require learners to add missing words to a sentence.
One resource available from PrintableWorksheets.in is a word baseball game from the Florida Center for Reading Research. The file includes a worksheet, game board and word cards. Learners correctly identify and read digraphs to advance around the baseball field.
For a more detailed look at digraphs, a complete lesson plan is available at BrightHubEducation.com. The plan includes writing a poem that uses a chosen digraph as a class and group work that involves learners making word flashcards.