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Different sets of numbers have different properties. For example,
The set of counting numbers is closed under addition but not under subtraction.
The set of integers is closed under addition, subtraction and multiplication but not under division.
Rational numbers are closed under all four basic operations of arithmetic, but not for square roots.
A set S is "closed" with respect to operation # if whenever x and y are any two elements of S, then x#y is also in S. y = 0 is excluded for division.
So, the answer depends on what you mean by "number".
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What Shape has no straight lines but has 2 rotation symmetry?
You can imagine any number of shapes that have these properties. A simple shape would be an elipse.You can imagine any number of shapes that have these properties. A simple shape would be an elipse.You can imagine any number of shapes that have these properties. A simple shape would be an elipse.You can imagine any number of shapes that have these properties. A simple shape would be an elipse.
What are the properties of the operation rational number?
Any number or decimal number that can be expressed as fraction is rational.
What are the properties of addition for elementary?
The relevant properties are the commutative property, the associative property, and the property of zero (i.e., if you add zero to a number you get the same number again).
Which properties can help you find the missing number?
none
What would the most efficient number of insulation layers be?
It is not simply a question of the number of layers but the properties of each layer.
