To annex, is a rather fancy, mathematical way of saying add.
i.e. Annex 3 to the following equation:
5x - 2x = 65 + 7y
In order to keep both sides equal (for it is still an equation) you must annex (add) to both sides.
i.e. 5x - 2x + 3 = 65 + 7y +3
* * * * *
It can also be used for multiplications in which multiples of 10 are involved.
For example,
To calculate 30 * 7
I would calculate 3*7 = 21 and then annex the 0 to the answer to make it 210.
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The math annex is an additional building or wing attached to a larger institution, such as a school or university, specifically dedicated to housing math-related departments, classrooms, offices, and resources. It serves as a specialized space for math education and research activities.