Number Prefixes

By M Anderson

Prefixes (uni, bi, tri)

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​How can I use prefixes as clues to understand the meaning of a given word?

Multiple Choice

What is a prefix?

• a group of letters placed before the root (base) word

• a group of letters, that is added to the end of a root (base) word

Prefix

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A prefix is a group of letters placed before a root word or base.

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Example: re --> again

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​What prefixes can you think of?

Draw

Brainstorm and write all of the prefixes you know.

Quantity (number) Prefixes

uni-

​​one

The student wishes she could ditch the school uniform, and show her own unique clothing style.

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Open Ended

What words can you think of that contain the prefix uni-?

Quantity (number) Prefixes

uni-

​​one

bi-

​​two

1. The volleyball team has tournaments bimonthly.

2. Beatrice is bilingual. She can fluently speak English and French.

Open Ended

What words can you think of that contain the prefix bi-?

Quantity (number) Prefixes

uni-

​​one

bi-

tri-

​​two

​​three

The YouTuber set up their camera on a tripod.

Open Ended

What words can you think of that contain the prefix tri-?

​Quiz Time!

​Let's see how much you learned today :)

Open Ended

The prefix tri- means _____.

Open Ended

The prefix uni- means _____.

Open Ended

The prefix bi- means _____.

Multiple Choice

Use your knowledge of prefixes to determine the meaning of the underlined word.

It is very difficult to balance on a unicycle.

• a cycle with one wheel

• A cycle with three wheels

• A cycle with two wheels

Multiple Choice

Use your knowledge of prefixes to determine the meaning of the underlined word.

Humans, ostriches, and kangaroos are all examples of bipeds.

• animals with one leg and foot

• Animals with two legs and feet

• animals with four legs and feet

Multiple Choice

Use your knowledge of prefixes to determine the meaning of the underlined word.

The Hunger Games series is an example of a trilogy.

• a book series that contains only 1 book

• a book series that contains 3 books

• a book series that contains two books