👩‍🏫 Teacher’s Guide

Objective
Students will apply prefix de using the examples and practice below.

Vocabulary
defrost, decode, devalue

Teaching Notes

• Model one response, then ask students to work independently and explain their choices with specific words or evidence.
• Teach the rule, discuss the worked example, and cover answers during practice.
• Use incorrect responses to identify which part of the rule needs another example.
• Allow approximately 25–35 minutes, including discussion and independent practice.

🧒 Student Worksheet

Concept and Helping Material

Big Idea
A prefix is added to the beginning of a base. In these examples, de contributes the meaning "reverse or remove." Word parts are clues; always check the whole word in context.

Word study

• defrost: remove frost
• decode: work out a coded message
• devalue: reduce value

Model
Read the first example. Identify the word part, explain the whole word, and test the meaning in a sentence.

Vocabulary and Definition

• — remove frost
• — work out a coded message
• — reduce value

Words to Learn

defrost, decode, devalue

Sentences to Fill In

1. The term for remove frost is ____.
2. The term for work out a coded message is ____.
3. The term for reduce value is ____.

Think & Respond Q&A

1. What does defrost mean?
2. Which word means "remove frost"?
3. What does decode mean?
4. Which word means "work out a coded message"?
5. What does devalue mean?
6. Which word means "reduce value"?
7. Use one practice word in a sentence that shows its meaning.

Hands-On Experiment or Activities

Make matching word and meaning cards. Match each pair, then group words with the same word part. Explain how the part affects the meaning. Check any spelling change when the part is added.

Reflection

• Explain one thing you learned.
• Write a short paragraph applying the skill. Underline your evidence or target words and explain one choice.