plus
sum
add
quantity
Addition ,subtraction, multiplicación,division etc.
Addition and subtraction are inverse operations. So you can solve addition by subtracting.
Other words are: division, subtraction, and addition.
addplus add on to
Addition works because like all mathmatics as long as you know 1/2 of the equation, answer, and type of equation (addition,subtraction,multiplication, or division) there is only 1 answer.
A product is the answer of a multiplication equation. A sum is the answer of an addition equation.
Some other words for "times" in math are "multiply" and "product".
The addition property of equality states that if you add the same number to both sides of an equation, then the sides remain even. This means that the equation remains to be true.
Brochures
numbers that are combined in addition process
The summands Also the addends
Some transition words for the 3rd paragraph could include "in addition," "furthermore," "moreover," or "similarly."