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Year 8 Interactive Maths - Second Edition


Expressions

An expression consists of terms that are written with arithmetical signs between them which include the addition, subtraction, division and multiplication signs.


Like Terms

Terms with the same pronumeral (or pronumerals) are called like terms.


Unlike Terms

Terms with different pronumerals are called unlike terms.


Addition or Subtraction of Like Terms

If the dollars are represented by the pronumeral d, then the statement

5 dollars + 10 dollars = 15 dollars

can be described by

5d + 10d = 15d


From the above discussion, we can state that:

Only like terms can be added (or subtracted) to simplify an expression.


Example 4

Solution:


Example 5

Solution:


Key Terms

expression, like terms, unlike terms


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