FOCUS ON MATH
Numerical Expressions
Symbols
Symbols or operators are used to indicate
addition (+), subtraction (-), multiplication
(×), and division (÷). These
symbols are also used in algebra. In a series
of operations, multiplication and division
(× and ÷) are done first in
the order they occur in the expression left
to right. Addition and subtraction (+ and
-) are done next in the order they occur
in the expression left to right.
Absolute Value
The absolute value of a signed number is
the number without the sign. The absolute
value of a number is indicated by placing
a vertical bar on either side of the number,
as for |A|
for the quantity A.
Multiplying with
Signed Numbers
When we multiply two numbers together, we
form a product. The numbers used to form
the product are called the factors of the
product.
Dividing with Signed
Numbers
In arithmetic, division is indicated by
the division symbol (÷). In algebra,
division is indicated as a fraction.
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