An affix is a piece stuck onto a word to change its meaning. UN on the front of
HAPPY reverses it. FUL on the end of HOPE turns a noun into a description.
The reason this is worth teaching is arithmetic. A student who knows twenty root words and six prefixes can work out considerably more than twenty-six words, because the pieces combine. Affixes are one of the few vocabulary lessons that multiply.
The affixes repeat, on purpose
Each one appears on several words in the bank:
- un-
UNHAPPY,UNKIND,UNABLE,UNUSUAL,UNDO - re-
REDO,REBUILD,REPLAY,RETURN,REVIEW - pre-
PREVIEW,PREPAY,PREHEAT,PRETEST - dis-
DISLIKE,DISAGREE,DISHONEST - mis-
MISPLACE,MISREAD,MISTAKE - -ful
HELPFUL,JOYFUL,CAREFUL,PLAYFUL - -less
HOPELESS,FEARLESS,ENDLESS - -ness
KINDNESS,DARKNESS - -ment
ENJOYMENT,PAYMENT,MOVEMENT
Meeting un- once is a fact. Meeting it on four words in ten minutes is a
pattern, and the pattern is what transfers to the next unfamiliar word.
Cover the root and read what is left
The activity that makes this stick takes two minutes.
Have students put a finger over the affix and read the word underneath.
UNHAPPY becomes happy. HOPELESS becomes hope. ENJOYMENT becomes enjoy.
Then ask what the covered piece did. Un- flipped it. -less took it away. -ment turned a thing you do into a thing you have.
Doing this to eight words in a row is the whole lesson, and it works because the sheet supplies the words already assembled.
Two that will trip them
MISTAKE looks like mis- plus take, and it does come from that historically,
but a mistake is not a bad way of taking something. The meaning has drifted far
enough that the parts no longer explain the whole.
Both earn their place on the sheet. A strategy that a student thinks always works will fail them silently. A strategy they know usually works, and that they know to check, is the useful version.
Build the one that is missing
The bank has CAREFUL but not CARELESS. It has HOPELESS but not HOPEFUL.
That is useful rather than an oversight.
After the search, put those two on the board and ask for the partner. A student
who can turn HOPELESS into HOPEFUL has stopped recognizing affixed words and
started making them, which is the whole point and a much harder skill.
Then push once more: FEARLESS gives FEARFUL, and both are real. ENDLESS
gives nothing, because ENDFUL is not a word. Finding the one that fails is
better practice than five that work, because it is the moment a student learns
that the pattern is a tool and not a law.
Which grid size
The 12x12 or 14x14. Almost every word here fits an 8x8, so this is not about length. It is about count: the 8x8 draws twelve words and the 14x14 draws twenty five, and the pattern only becomes visible when the same affix turns up several times on one sheet.
The larger sizes also use all eight directions, which suits third and fourth grade.