The four main math operators are the subtraction (-), addition (+), multiplication (x or *) and division (÷ or /).
Note: the items to be multiplied are also referred as Multiplicand x Multiplier = Product. See related link.
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North south east west up down left right
The main set operations are: union, intersection and complement.
yes
The answers are:Metric system and English system
Acute, obtuse, right, and straight angles.