Curriculum Alignment First
Before generating a worksheet, look at your upcoming unit. If you are teaching the water cycle, your words shouldn't just be general nature terms. They need to be specific: evaporation, condensation, precipitation. By scrambling these specific terms, students are forced to interact with the spelling of words they will soon encounter in their textbook.
Formatting for Cognitive Load
A cramped worksheet induces anxiety. When printing scrambles, prioritize clean layouts. Ensure there is ample space between the scrambled letters and a clear, distinct line for the student to write their answer. If you have struggling writers, provide 'letter boxes' instead of a single line to hint at the word length.
The Pre-Reading Primer
Use a printable puzzle set *before* introducing a new reading passage. Select the 5 most difficult vocabulary words from the text. Have students unscramble them and discuss what they might mean. When they encounter the word in the text later that day, they will have prior orthographic familiarity with it.