Mastering Prefixes

Overview

This 70-minute lesson introduces 5th-grade students (in Nunavut) with reading ability at Grade 3 level to prefixes. The lesson aligns with the Ontario Language Curriculum and focuses on language skills development, vocabulary building, and word recognition to support struggling readers.

Curriculum Expectations (Ontario Language Curriculum, Grade 5)

Reading: Vocabulary Development

1.4 identify and explain the meanings of words with common prefixes and suffixes (e.g., un-, re-, pre-, -ful, -less) in familiar and some new contexts
1.5 use knowledge of prefixes and suffixes to determine the meaning of unfamiliar words and clarify meaning

Language: Vocabulary Strategies

2.2 extend vocabulary by inserting new words with prefixes into oral and written language

Assessment for Learning and Communication

3.5 communicate clearly using oral and written language, demonstrating vocabulary development

Learning Goals

Understand what prefixes are and how they change word meanings
Identify common prefixes (un-, re-, pre-)
Use prefixes to decode new words and expand vocabulary

I Can Statements

I can explain what a prefix is.
I can identify and use common prefixes (un-, re-, pre-) in words.
I can use prefixes to figure out the meaning of new words.

Success Criteria

Correctly defines prefix and gives examples
Identifies prefixes in given words and explains their function
Demonstrates ability to form new words with prefixes in activities
Uses new vocabulary with prefixes in conversation or writing

Materials Needed

Whiteboard and markers
Prefix word cards (un-, re-, pre-)
Word-building activity sheets
Chart paper with anchor charts on prefixes
Individual mini whiteboards for students
Visual aids / pictures for word examples
Audio recordings for pronunciation practice

Lesson Procedure

1. Activation & Introduction (10 minutes)

Engage students with a quick interactive game: display two words related by a prefix (e.g., happy/unhappy) and elicit differences in meaning.
Ask: "What do these words have in common?" (Root word "happy")
Introduce the term “prefix” as a group of letters added to the beginning of a word that changes the word’s meaning.
Show anchor chart with definition and examples: un-, re-, pre-.

I Can: I can explain what a prefix is.

Differentiation: Students who need extra support receive visual cues and simplified definitions with picture support.

2. Explicit Teaching and Modelling (15 minutes)

Introduce each prefix separately:
- un- meaning “not” (e.g., unhappy, unlock)
- re- meaning “again” (e.g., redo, retell)
- pre- meaning “before” (e.g., preview, prepare)
Display words and model how meanings change when prefix is added.
Students repeat words with correct pronunciation via call and response.
Use TPR (Total Physical Response) moments (e.g., shaking head “no” for un-) to reinforce meaning.

I Can: I can identify and use common prefixes in words.

Differentiation: Students needing further support get extra modelling with picture-word match cards. Advanced students make sentences using given prefix words aloud.

3. Guided Practice (15 minutes)

Distribute mini whiteboards. Call out root words and have students write the new word with prefix you say aloud (e.g., “make” with “re-” → “remake”).
Students share their words with a partner using “I can say…” statements.
Use sorting activity: students sort word cards into prefix groups on desks or a board.

I Can: I can form new words with prefixes and use them with a partner.

Differentiation: Provide word banks or picture cards for students struggling to spell or form words. Challenge advanced learners to create two new words with different prefixes.

4. Independent Practice - Creative Application (20 minutes)

Students complete a word-building worksheet where they add prefixes to root words and write a sentence using the new word.
Option: "Prefix Detective" – students read a short story excerpt containing words with prefixes and underline those words, then explain their meanings in pairs.
Circulate to support and provide immediate feedback.

I Can: I can use words with prefixes in sentences to show understanding.

Differentiation: For students with reading difficulty, listen to an audio version of the story while following along. Allow students to draw a picture that represents the meaning of the prefixed word.

5. Consolidation and Sharing (10 minutes)

Invite volunteers to share one new word and sentence with the class.
Recap the lesson by revisiting the anchor chart and having students give thumbs up if they feel confident with prefixes.
Reinforce the importance of prefixes to unlock the meaning of words in reading and writing.

I Can: I can talk about prefixes and share my new vocabulary.

Assessment & Feedback

Observe student participation in partner activities and word-sorting.
Collect and review mini whiteboards and worksheet sentences for correct prefix usage and understanding.
Confer briefly with select students to check comprehension.
Provide verbal praise and corrective feedback with positive reinforcement.

Additional Differentiation Strategies

Use multi-sensory approaches (visual, auditory, kinesthetic).
Pair students strategically to support peer mentoring (stronger reader with developing reader).
Offer sentence starters or scaffolded frames for writing tasks (e.g., “The prefix ‘un-’ means not. So, unhappy means not happy.”).
Provide frequent breaks and use clear, concise instructions.

Reflection/Extension Ideas for Teachers

Follow-up lessons could focus on suffixes or compound words to deepen morphological awareness.
Encourage students to create a "Prefix Word Wall" where they post new words learned over time.
Use digital tools or apps to create interactive prefix games appropriate for Nunavut students’ reading levels.

This lesson plan ensures measurable growth in vocabulary and decoding skills based on Ontario curriculum expectations while tailored to the needs of Nunavut students reading below grade level.

Teaching Instructions