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Children's Dictionary
add to perform the mathematical operation of addition. [1/5 definitions]
division sign a mathematical sign made up of a small horizontal line with one dot above it and one dot below it ( ). It indicates that the number coming before it is to be divided by the number coming after it.
engineering the study and practice of using scientific and mathematical knowledge to do practical things. Knowledge of engineering is needed to design and build roads, bridges, tools, and machines.
multiplication sign a mathematical sign (x) that says that the numbers before and after it are to be multiplied.
parenthesis either of a pair of punctuation marks ( ). They are used to enclose information that is not part of the main sentence. They are also used to set apart mathematical quantities to be treated as a unit.
plus sign a mathematical sign (+) indicating addition or a positive quantity.
subset a mathematical set made up of elements that are in a given set.