1. Prefixes: Important Word Parts  What is a prefix? A. A word part at the end of a word B. A word part in the middle of a word C. A word part at the beginning of a word

2. Prefixes: Important Word Parts  What is a prefix? C. A word part at the beginning of a word

3. Prefixes change words! locked Can you get into a locked door?

4. Let’s add a prefix locked Can you get into an unlocked door? un

5. How did the prefix change meaning of the word? un- The prefix was un -. Un- changes the meaning of a word. Tell your partner how unlocked is different from locked.

6. How did the prefix change meaning of the word?  The prefix un- means “the opposite of” or “not”  So, when the door is unlocked, we could also say that it is “the opposite of locked”, or “not locked”  Adding the prefix changes what the word means

7. Let’s look at another word pack What does it mean to pack a suitcase?

8. Let’s look at another word pack What does it mean to unpack a suitcase? un

9. Let’s look at another word pack Unpack means “the opposite of” pack un

10. Some questions! Which would you rather eat? a ripe apple an unripe apple

11. Some questions! Which would you rather eat? a ripe apple Ready to eat an unripe apple Not ripe, not ready

12. Some questions! Which would you rather eat? Spoiled food Unspoiled food

13. Some questions! Which would you rather eat? Spoiled food Rotten, bad Unspoiled food Not rotten, not bad

14. What do you know so far?  On your paper, explain what a prefix is  Come up with at least three other words that have the prefix “un”

15. Another prefix expensive What does expensive mean? Talk about it with your partner.

16. Another prefix expensive in Let’s add the prefix in -. How does this change the meaning of the word?

17. Another prefix expensive in Inexpensive means “not expensive”, or “the opposite of expensive”. The prefix in - can mean the same thing as the prefix un-

18. The prefix in-  Sometimes, the prefix in- has the same meaning as un-  Think about these words:  Inexpensive (not expensive)  Inexperienced (not experienced)  Independent (not dependent)

19. Be careful with in- Does indoor mean “the opposite of door”?

20. Be careful with in- Does indoor mean “the opposite of door”? No! In- does not always have the same meaning as un-. You have to read carefully.

21. What meaning of in- do you see? in vertebrate Does in- mean “not” in this word? Or does it mean “inside”?

22. What meaning of in- do you see? in vertebrate An invertebrate is a creature that does NOT have a backbone. So we see that the meaning of in- is “not”.

23. Let’s review  Talk about these questions with a partner. –What is a prefix? –What are some prefixes that we have learned about so far?

24. A new prefix Non- is another prefix. Like un-, non - means “not” or “without”

25. Using the prefix non- The prefix non- is used in a slightly different way from un- To understand this, let’s look at milk!

26. Using the prefix non- Milk often has the fat removed to make it healthier It wouldn’t make sense to use “un-fat” milk, because that would mean that the milk is the opposite of fat

27. Using the prefix non- Instead, we use the prefix “non-” to show that the milk has had the fat removed nonfat

28. Other words with “non-” nonsense nonliving nonstop nonfiction What do these words mean?

29. Prefix or not? Let’s look for prefixes in some words. Be careful! Not every word will actually have a prefix. unhappy

30. Prefix or not? Let’s look for prefixes in some words. Be careful! Not every word will actually have a prefix. unhappy This word shows the prefix un-. It means “not happy” or “the opposite of happy”

31. Prefix or not? introduction There is no prefix here. “Introduction” does not mean “the opposite of troduction”

32. Prefix or not? none This does not have a prefix. “None” does not mean “without e” (But it would be pretty funny!

33. Prefix or not? inedible

34. Prefix or not? inedible This word has the prefix in-. It means “not edible” or “not able to be eaten”

35. What have you learned? What is a prefix? What are some prefixes that mean “not”? How do prefixes change words?