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5.2: Review of Elements, Simple Addition, and Compound Words

Difficulty Level: At Grade Created by: CK-12
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1. Elements are the smallest parts of written words that add meaning to the words. There are three kinds of elements: prefixes, bases, and suffixes.

Prefixes are elements that go at the front of words and cannot stand free as words. Un- and re- are prefixes in the words unpainted and remixing.

Bases are elements that can have prefixes and suffixes added at the front and back.

Free bases are bases that can stand free as words, like the bases paint and mix in the words unpainted and remixing.

Suffixes are elements that go at the end of words and cannot stand free as words. In the words unpainted and remixing,-ed and -ing are suffixes.

2. The Rule of Simple Addition. Unless you know some reason to make a change, when you add elements together to spell a word, do not make any changes at all. Simply add the elements together.

Add the following prefixes and suffixes to the free bases to spell words. All of the elements combine according to the Rule of Simple Addition:

Prefix + Free Base + Suffix = Word
un + friend + ly = unfriendly
un + fail + ing = unfailing
re + move + s = removes
re + search + er = researcher
un + arm + ed = unarmed
re + arm + ing = rearming
un + finish + ed = unfinished
re + finish + ed = refinished
un + trust + ing = untrusting
re + act + ing = reacting

3. Now try some the other way around. Analyze each of the following words into its elements. Most contain a prefix. All contain a free base and a suffix:

Word = Analysis
unmixed = un + mix + ed
remixing = re + mix + ing
searches = search + es
losses = loss + es
redrawing = re + draw + ing
undoctored = un + doctor + ed
genies = genie + s

4. Compound Words. Words like somebody that are made up of two or more shorter words are called compound words, or just compounds.

Divide each of the following words into two parts. In some words Part 1 is a prefix and Part 2 is a free base. In some words Part 1 is a free base and Part 2 is a suffix. Some of the words are compounds in which both Part 1 and Part 2 are free bases.

Word Part 1 Part 2
searchlight search light
remove re move
strikeout strike out
gathered gather ed
landfill land fill
inchworm inch worm
roaster roast er
trusted trust ed
rewrap re wrap
birdcage bird cage
youths youth s
mixer mix er

Write the five compound words from the table above into these boxes: . . .

\begin{align*}searchlight && strikeout && landfill && inchworm && birdcage\end{align*}

In each of the five compounds did the shorter words combine through simple addition?


Nearly all compound words combine by simple addition

Teaching Notes.

Item 1. Elements, bases, and suffixes are introduced in Book 1, Lesson 28. Prefixes are introduced in Book 2, Lesson 40.

Item 2. The Rule of Simple Addition is introduced in Book 1, Lesson 30.

Item 3. Compounds are introduced in Book 1, Lesson 31. They are also discussed in Book 2, Lessons 13-14, 38-39.

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Date Created:
Feb 23, 2012
Last Modified:
Jul 07, 2015
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