Fractions are not integers. They may or may not be rational numbers.
There is no single commonly accepted definition for "whole numbers". Depending on the definition used, zero, as well as negative integers (like -1, -2, etc.) may, or may not, be considered part of the "whole numbers".
Natural numbers are sometimes defined to include zero, sometimes not. Equivalent terms therefore may include: positive integers, non-negative integers, whole numbers, positive whole numbers ("whole number" is ambiguous; some take it to include negative numbers, some not).
8 and 10. Since they are integers, they may not include decimals, so the answer is simply just the numbers you would find by adding or subtracting 1.
The basic idea is the same as when you estimate sums and differences of larger numbers (which may or may not be integers). You round the numbers to one or two decimal digits, then add them up.
Fractions are not integers. They may or may not be rational numbers.
They may be called integers, rational numbers, real numbers. In any one of these sets they are additive inverses.
The term "whole number" is somewhat ambiguous. It MAY refer to integers; or it MAY refer only to non-negative integers ("counting numbers").
Whole numbers are integers. Integers are whole numbers.
This may or may not be true. The set of "counting numbers" may either be defined as all positive integers (1, 2, 3, 4...) or as all non-negative integers (0, 1, 2, 3, 4...). Similarly, the set of "whole numbers" may be defined as all positive integers, all non-negative integers, or as all integers (...-3, -2, -1, 0, 1, 2, 3...). It all depends on the definition given for each term.
There is no single commonly accepted definition for "whole numbers". Depending on the definition used, zero, as well as negative integers (like -1, -2, etc.) may, or may not, be considered part of the "whole numbers".
The term "whole numbers" is ambiguous; it may refer either to integers, or only to positive integers (perhaps including zero). The set of integers is closed under subtraction, that means, you can subtract any number from any other number. This is not possible in the set of counting numbers (non-negative integers).
18 positive integers and 36 integers (negative and positive)
No. Natural numbers may or may not include 0, depending on who you ask (i.e. they can begin 0, 1, 2, 3, … or 1, 2, 3, 4, …), but they don't ever include the negative numbers. However, integers, which are a superset of the natural numbers (i.e. the natural numbers are contained "in" the integers), do include negatives.
There is no limit to the numbers in the world.
Directed numbers have a positive or negative sign associated with them. (The positive sign may be implied). They can be rational fractions (including mixed numbers) or irrational. Integers cannot be fractions or irrational.
All integers are rational numbers, but not all rational numbers are integers.2/1 = 2 is an integer1/2 is not an integerRational numbers are sometimesintegers.