sum
'Total up' means to add
In a word problem, the word 'is' most likely means that two quantities are equal.
No, "altogether" is not another word for addition. "Altogether" means completely or entirely, while addition refers to the mathematical operation of joining two or more numbers together to get a sum.
1897
the sum or the total
The summands.
Sum means add together. Eg: The sum of two and six is eight.
3+2+3
Addition is the inverse operation of subtraction and multiplication is the inverse operation of division. The word inverse means "opposite".
"What is 3*(-5)" would be such a problem.
Twice is a word that means two.
That is non-commutativity. Matrix multiplication is non-commutative although addition still is.