Year 7 Interactive Maths - Second Edition

Expressions

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

Clearly, 5 dollars + 10 dollars = 15 dollars

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, arithmetical signs, like terms, unlike terms, simplify an expression