Prefixes

Prefix

pREFIX

A prefix is a letter or word added to a base word used to change its meaning.

Prefix

​Root word

pREFIX

Prefixes can be added to nouns, verbs, and adjectives.

pREFIX

Understanding prefixes can help students decode unfamiliar words when they are reading.

pREFIX

Prefixes can be used to expand vocabulary and improve writing compositions.

negative prefixes

• Un- not/the opposite of ---- interested - uninterested

• De- the opposite of/reversing ---- frost - defrost

• non- not/lacking ---- existent - nonexistent

• dis- not/the opposite of ---- agree - disagree

• in-* - not/the opposite of ---- complete - incomplete

• a/an-not/without ---- moral - amoral

• anti- against/opposed to ---- bacterial - antibacterial

​*The prefixes "il-", "ir-", and "im-" have the same meaning as the prefix "in-", but they are used before words that start with "l", "r", and "m" or "p" respectively.

Other Prefixes

• re- again

• pre- before

• bi- two/ twice

• co- with/together

• hyper- extreme

• mid- middle

• mini- small

• over- excessive

• semi- half

• sub- under

• super- above/ beyond

• tri- three

• uni- one

Multiple Choice

What's the opposite of acceptable?

• DISACCEPTABLE

• UNACCEPTABLE

• INACCEPTABLE

• IRREACCEPTABLE

Multiple Choice

What's the opposite of honest?

• DISHONEST

• UNHONEST

• IMHONEST

• INHONEST

Multiple Choice

The smell of garbage is very ___________.

• unpleasant

• nonpleasant

• pleasantful

• repleasant

Multiple Choice

What's the opposite of patient?

• IRPATIENT

• INPATIENT

• UNPATIENT

• IMPATIENT

Multiple Choice

What's the opposite of proper?

• INPROPER

• DISPROPER

• IMPROPER

• UNPROPER

Multiple Choice

What's the opposite of affected?

• UNAFFECTED

• IRREFFECTED

• INAFFECTED

• IMAFFECTED

Multiple Choice

What does the prefix ‘anti’ mean?

• against

• for

• small

• large

Multiple Choice

Fill in the blank: 
My mom wanted milk without fat. 
She wanted ___fat milk. 

• non-

• pre-

• re-

• un- 

Multiple Choice

Fill in the blank: 
Dinosaurs existed at the beginning of time. 
These times were called ___historic. 

• non-

• pre-

• un-

• re-

Multiple Choice

Fill in the blank: 
Juan and I __agreed about who won the game. 

• mis-

• pre-

• sub-

• dis-

Multiple Choice

Fill in the blank: 
The divers ___merged themselves under water. 

• sub-

• re-

• pre-

• -ing

Multiple Choice

The word unhappy means?

• very happy

• not happy

• really happy

• sad

Multiple Choice

What does the word rewrite mean?

• write first

• write again

• write over

• write right

Multiple Choice

Define the word antisocial.

• don't have friends

• able to grow food

• out of control

• unable to move

Multiple Choice

What is the root word in the word review?

• re

• view

• review

• Sally