1. Fractions, Decimals, and Order of Operations
Chapter 1 / Whole Numbers and Introduction to Algebra
Section 5.5
Fractions, Decimals, and Order of Operations

2. Chapter 1 / Whole Numbers and Introduction to Algebra
Writing Fractions as Decimals
To write a fraction as a decimal, divide the numerator by the denominator.
Martin-Gay, Prealgebra, 5ed

3. Chapter 1 / Whole Numbers and Introduction to Algebra
Comparing Fractions and Decimals
To compare decimals and fractions, write the fraction as an equivalent decimal.
Compare and
Therefore, < 0.25
Martin-Gay, Prealgebra, 5ed

4. Chapter 1 / Whole Numbers and Introduction to Algebra
Order of Operations
1. Do all operations within grouping symbols such as parentheses or brackets.
2. Evaluate any expressions with exponents.
3. Multiply or divide in order from left to right.
4. Add or subtract in order from left to right.
Martin-Gay, Prealgebra, 5ed

5. Using the Order of Operations Martin-Gay, Prealgebra, 5ed
Simplify ( – 2.3) ( )
( – 2.3) ( )
= ( – 2.3) (5.3)
Simplify inside parentheses.
Objective D Continued
= (5.3)
Write ( – 2.3)2 as 5.29. =
Multiply.
= 27.02
Add.
Martin-Gay, Prealgebra, 5ed

6. Martin-Gay, Prealgebra, 5ed
Finding the Area of a Triangle
height A
base • height = 1 2
base A bh = 1 2
Martin-Gay, Prealgebra, 5ed