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 20 min- Step 1Warm up our ears (blend & segment)2 min
- Steps 2 & 3Look & Say / Listen & Spell4 min
- Step 4Blending drill3 min
- Step 5New concept6 min
- Step 5Read & spell the new words5 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)
Sound 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.
👂 Listen & Spell — teacher list (7 sounds)
Say each sound; students write the spelling(s). Read straight from this list.
- /ā/a (as in table), ai (as in rain), ay (as in play), aigh, ei, eigh, ey (as in key) · rain
- /ē/e (as in me), y (as in baby), ea (as in eat), ee (as in see), ey (as in key) · eat
- /ī/i (as in find), igh (as in night), y (as in cry) · night
- /ō/o (as in go), oa (as in boat), ow (as in snow), oe (as in toe), ough · boat
- /oi/oi (as in coin), oy (as in boy) · coin
- /o͞o/oo (as in book), u (as in cup) · moon
- /aw/aw (as in lawn), au (as in haul), ough · paw
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.
Read & Spell
Read — I do
Read — We do
Spell — I do
Spell — We do