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Do you need to know all of the factors of a number to know it is prime or composite?
To know that a number is prime you need to know that it has no factors other than 1 and the number itself.To know that a number is composite you only need to know one factor other than the number itself or 1.
How can you calculate the number of edges on a polyhedron given only the shapes?
The answer will depend on what is known of the shape. If you know only the number of faces, or only the number of vertices, then you cannot work out the number of edges. If you only know the shapes of the faces you cannot.The answer will depend on what is known of the shape. If you know only the number of faces, or only the number of vertices, then you cannot work out the number of edges. If you only know the shapes of the faces you cannot.The answer will depend on what is known of the shape. If you know only the number of faces, or only the number of vertices, then you cannot work out the number of edges. If you only know the shapes of the faces you cannot.The answer will depend on what is known of the shape. If you know only the number of faces, or only the number of vertices, then you cannot work out the number of edges. If you only know the shapes of the faces you cannot.
How can number senses help to know if you have subracted two mixed number correctly?
if you know the operation of your number you can do inverse operation
How can you know if a number is a multiple of another number?
When it is a factor of that particular number.
How do you know that 7 is a prime number?
You know that 7 is a prime number because it only has two factors.
