The worksheet titled "Fill in the Missing Letters: A Letter Sounds and Combinations Activity" features words in boxes. Each letter of the word is contained in a single box, with one box left blank. Students must figure out which letter is missing and write it in the box.

Empty boxes can be found in the middle and at the end of words, and they can include vowels or consonants. Upper-grade level worksheets feature words with two missing boxes. Sometimes the boxes are located next to each other, so students must fill in a two-letter combination, and sometimes they are situated between other letters, so students only solve one letter sound at a time.

The bottom of each worksheet features lines of boxes that are completely empty. Students write their own words according to the number of boxes that need to be filled in.

Practicing letter sounds and combinations is best done when students can focus on sounds without having to focus on spelling the entire word. For example, you can give them words and leave one letter out. They have to figure out which letter goes in that spot.

This is a great way for young students to practice specific letter sounds, but it can also be a great way for older students to practice letter sound combinations. For example, students could practice "ou" words or double-consonant words.

Once students get the hang of it, they can create their own missing letter puzzles for classmates to solve. You can also ask them to write words with a certain number of letters to practice their spelling and critical thinking skills.