Pre-Algebra : Number Theory
Study concepts, example questions & explanations for Pre-Algebra
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Example Questions
Example Question #21 : Number Theory
What type of number is 
None
Irrational
Integer
Decimal
Fraction
Fraction
An integer is a whole number, either positive or negative. In other words, it is a number that can be written without a fractional or decimal part. Examples are:
Example Question #22 : Number Theory
an integer
a fraction
a decimal
an irrational number
a complex number
an integer
An integer is any positive or negative whole number.
Therefore, 
Example Question #23 : Number Theory
Which of the following is not an integer?
Integers are all counting numbers, and include both 
Example Question #21 : Number Theory
What do you get when you add two negative integers?
Sometimes negative
Sometimes positive
Always positive
Always negative
zero
Always negative
When you add two negative numbers, the answer is always negative. When adding negative numbers, we treat as an addition problem but we need to add the negative sign afterwards. Two negative numbers can never add to zero.
Example Question #22 : Number Theory
Which is a rational number?
All the numbers are irrational numbers. They are basically numbers that can't be expressed as fractions. They dont have definite values. 
Example Question #23 : Number Theory
What is an integer?
Only negative numbers.
A number that can either be positive, negative or zero and must be a whole number.
Just numbers from one to ten.
Any number.
Only positive numbers.
A number that can either be positive, negative or zero and must be a whole number.
An integer is a number that is whole and doesn't have a decimal or a fraction. The number can be positive, negative, or zero.
Example Question #24 : Number Theory
Which of the following is NOT an integer?
An integer is a number that has no decimals or fractions. They must be whole numbers whether positive, negative or zero. 
Example Question #18 : Integers And Types Of Numbers
What's a natural number?
Negative integers only
Imaginary numbers
Positive integers only
Negative integers and zero
Positive integers and zero
Positive integers and zero
Natural numbers are numbers that occur naturally meaning they range from zero onwards. Negative numbers dont occur naturally.
Example Question #19 : Integers And Types Of Numbers
What are counting numbers?
Irrational numbers
Zero
Negative integers
Positive integers
Natural numbers
Positive integers
Counting numbers are numbers you can count with your hands. We start from one and onward. They are the same as positive integers.
Example Question #25 : Number Theory
What are prime numbers?
Numbers that have a factor of one and itself
Number with multiple factors besides one and itself
All fractional numbers
Trignometric functions
Negative integers that have a factor of 
Numbers that have a factor of one and itself
Example of prime numbers are 
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