and
conjunction
used in calculations for showing that numbers are added together
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adverb, determiner, preposition, pronoun
used in front of a number or amount to state that it should be taken away from another number or amount that you have just mentioned
verb
used in mathematics for saying that you are imagining that something is true, usually in order to prove a principle of mathematics
adjective, preposition
used in mathematics for showing that you are taking one number from another. This word is usually represented by the symbol 
adjective, conjunction, preposition
used for showing that one number or amount is added to another. This word is usually represented in mathematics by +
noun
used in mathematics for saying how many times you multiply a number by itself. For example ‘10 to the power of 3’ means 10x10x10.
used for saying how a number is calculated

Open Dictionary
any random process, such as a competition in which a name is drawn from a hat
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