Identity of addition means the answer and then add
in all means addition
"And" in algebra usually means addition.
It means that in an addition such as: a + b + c it doesn't matter whether you do the addition on the left, or the addition on the right, first. Similar for multiplication.
"sum" means addition.... +
Doubling a number means multiplying it by 2. This is equivalent to adding the number to itself. Halving means dividing by 2. This is equivalent to multiplying by 1/2 (or by 0.5); since this is not an integer, it can't be reduced to addition.
Also means in addition to and as well as. It begins with the letter a.
Identity of addition means the answer and then add
The phrase "as well as" means the same as "in addition to".
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"and" means multiplication "or" means addition
It means the same as too, as well, in addition to.
It means "also".
"and"
in all means addition
It means outside of or in addition to, or beyond what is usual. For instance, extracurricular, means in addition to or outside of your normal curriculum.
Equivalent to means equal to or the same as.