Numbers are placed in categories based on their properties. A natural number is greater than zero and has no decimal or fraction attached. These are also sometimes called counting numbers. {1, 2, 3, 4, ...}Whole numbers are natural numbers and the number zero. {0, 1, 2, 3, 4, ...}Integers include...

### 1. Types of Numbers TEAS 90

Numbers are placed in categories based on their properties. A natural number is greater than zero and has no decimal or fraction attached. These are also sometimes called counting numbers. {1, 2, 3, 4, ...}Whole numbers are natural numbers and the number zero. {0, 1, 2, 3, 4, ...}Integers include...

### 1. Types of Numbers

Numbers are placed in categories based on their properties. A natural number is greater than zero and has no decimal or fraction attached. These are also sometimes called counting numbers. {1, 2, 3, 4, ...}Whole numbers are natural numbers and the number zero. {0, 1, 2, 3, 4, ...}Integers include...

### 10. Comparison of Rational Numbers

Rational numbers can be ordered from least to greatest (or greatest to least) by placing them in the order in which they fall on a number line. When comparing a set of fractions, it is often easiest to convert each value to a common denominator. Then, it is only necessary...

### 9. Percentages

A percent (or percentage) means per hundred and is expressed with a percent symbol (%). For example, 54% means 54 out of every 100. A percent can be converted to a decimal by removing the % symbol and moving the decimal point two places to the left, while a decimal...

### 8. Proportions

A proportion is an equation which states that two ratios are equal. Proportions are given in the form a/b = c/d, where the a and d terms are the extremes and the b and c terms are the means. A proportion is solved using cross-multiplication to create an equation with...

### 7. Ratios

A ratio is a comparison of two numbers and can be represented as a/b(b ≠ 0), a:b, or a to b. The two numbers represent a constant relationship, not a specific value: for every a number of items in the first group, there will be b number of items in...

### 6. Rounding and Estimation

Rounding is a way of simplifying a complicated number. The result of rounding will be a less precise value that is easier to write or perform operations on. Rounding is performed to a specific place value, such as the thousands or tenths place. The rules for rounding are as follows:...

### 5. Decimals and Fractions

### 4. Order of Operations

When solving a multi-step equation, the order of operations must be used to get the correct answer. Generally speaking, the problem should be worked in the following order: 1) parentheses and brackets; 2) exponents and square roots; 3) multiplication and division; 4) addition and subtraction. The acronym PEMDAS can be...