If you are adding, the result is a sum. This terminology applies whether the addends (the terms you are adding) are whole numbers or they are expressed as fractions or in decimal notation. The same is true of the sum.
it stay the same when you subtract fractions and when you add fractions.
In fractions, you can NEVER add or subtract
Fractions! Otherwise you don't have anything to add.
Change them into mixed numbers and add the integers and fractions together ensuring that the fractions have a common denominator.
No.
no
add by adding
Change them to like fractions and proceed.
Because you can't add or subtract fractions that have different denominators. Making them like fractions, by multiplying so the denominators are the same, you can add and/or subtract them.
"Unlike" fractions.
with a calculator
No.