Prefix Power: Anti, Auto & Bi Words for Class 5 

This Grade 5 English worksheet focuses on understanding prefixes “anti-,” “auto-,” and “bi-” and how they change the meaning of root words. Through engaging and structured exercises, students learn how prefixes like “anti” (against), “auto” (self), and “bi” (two) help build new words and expand vocabulary. 

Why Prefixes Matter in Grammar? 

Prefixes are important building blocks of words that help students decode meanings quickly. For Grade 5 learners, understanding prefixes is essential because: 
1. They help break down unfamiliar words into meaningful parts. 
2. They improve vocabulary and reading comprehension. 
3. They support spelling and word formation skills. 
4. They enhance logical thinking and word analysis. 

What’s Inside This Worksheet?

 This worksheet includes five engaging grammar activities that strengthen understanding of prefixes: 

🧠 Exercise 1 – True or False 
Students identify correct and incorrect statements about prefix meanings like “anti,” “auto,” and “bi.” 

✏️ Exercise 2 – Match the Following 
Students match words such as antidote, bicycle, and autobiography with their correct prefix meanings like “against,” “two,” and “self.” 

📋 Exercise 3 – Fill in the Blanks 
Students complete sentences using correct prefix-based words such as “bilingual,” “automatic,” and “antiseptic.” 

📝 Exercise 4 – Multiple Choice Questions 
Students choose the correct word based on prefix meanings (e.g., “against disease,” “self-written life,” “two wheels”). 

🔄 Exercise 5 – Sentence Rewriting 
Students rewrite incorrect sentences using proper prefix words, reinforcing conceptual clarity. 

✅ Answer Key (For Parents & Educators) 

Exercise 1 – True or False 
1. True 
2. False 
3. True 
4. True 
5. False 
6. True 
7. True 
8. False 
9. False 
10. True 

Exercise 2 – Match the Following 
antidote–against, autograph–self, bicycle–two, antifreeze–against, autopilot–self, bilingual–two, antiseptic–against, automatic–self, binoculars–two, autobiography–self 

Exercise 3 – Fill in the Blanks 
1. three 
2. autobiography 
3. automatic 
4. antiseptic 
5. bilingual 
6. binoculars 
7. autopilot 
8. autobiography 
9. antiseptic 
10. bicycle 

Exercise 4 – Multiple Choice Questions 
1. b) antiseptic 
2. b) autobiography 
3. a) bicycle 
4. b) autopilot 
5. a) antifreeze 
6. b) bilingual 
7. a) autograph 
8. a) antiseptic 
9. a) binoculars 
10. a) automatic 

Exercise 5 – Sentence Rewriting 
1. The machine works automatically. 
2. He wrote his life story himself (autobiography). 
3. The cream fights germs (antiseptic). 
4. She knows two languages (bilingual). 
5. The car uses autopilot. 
6. He signed his own name (autograph). 
7. The tool works with two eyes (binoculars). 
8. The medicine fights germs (antiseptic). 
9. The cycle has two wheels (bicycle). 
10. The system works automatically (automatic). 

Help your child decode word meanings faster and build strong vocabulary skills by mastering prefixes like anti, auto, and bi. 
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