Lesson 127
uni-, bi-, tri-
The prefix UNI- means one, BI- means two, and TRI- means three
Be sure students do not confuse the prefixes UNI- and UN-. For example, in the word unimpressed, the prefix being used is UN- meaning not, not UNI- meaning one. Be sure students do not confuse the prefixes BI- and BIO-. For example, in the word biology, the prefix being used is BIO- meaning life, not BI- meaning two.
Today's plan
about 15 min- Step 1Warm up our ears (blend & segment)2 min
- Steps 2 & 3Look & Say / Listen & Spell4 min
- Step 4Blending drill3 min
- Step 5New concept + read/spell6 min
Warm Up Our Ears
Say the sounds; students blend them into a word. Then say a word; students break it apart.
Blend it (teacher says sounds → you say word)
Break it (I say word → you say sounds)
Flashcard Drills
Full-screen cards for the class. Tap a card to check the answer, or press Hear the words to hear the example words read aloud.
Blending Drill
Change one part at a time and read the new word.
New Concept
Today we learn three new prefixes: UNI-, BI-, and TRI-.
Highlighted words are the ones to show and practice reading — tap one to hear it.
Prefixes are added to the beginning of a word to change the word's meaning. Today we will learn three new prefixes: UNI-, BI-, and TRI-. UNI-: UNI- means one. The U in UNI- makes the long /yo͞o/ sound and the I makes the schwa sound /ə/, as in . BI-: BI- means two. The I in BI- makes the long /ī/ sound, as in . TRI-: TRI- means three. The I in TRI- usually makes the long /ī/ sound, as in but sometimes makes the short /i/ sound, as in .
uni-, bi-, tri-
We can remember what these prefixes mean by adding each prefix to the base cycle. A unicycle has one wheel, a bicycle has two wheels, and a tricycle has three wheels.