They are also called one. There are synonyms and mathematical terms: unit, or multiplicative identity but there is little advantage in using these terms.
additive inverses
When one of the numbers is a factor of the other.
Yes, if one of the numbers is a factor of the other.
Absolute value
2,4,6,8,10,12,14,16,18
yes
no it doesnt. two negative numbers equal a negative number. two postivie numbers equal a positive number. one negative and one positive number equal a negative number.
1
Odd numbers are those that cannot be evenly split into two equal amounts of whole numbers. For instance, 4 can be split into two equal amounts of 2; 6 can be split into 3. These are called "Even" numbers because they can be split into even (or equal) amounts. An odd number like 1, or 3, or 5, or 7 and so on cannot be split into two equal amounts of whole numbers. They are called, "odd" numbers simply because they are not 'Even' numbers. They could have been called, "Uneven" numbers, but a shorter word seemed easier. Odd, isn't it.
For two numbers to be equidistant from zero, one must be the negative of the other. As one is the negative of the other, it is the additive inverse of that number. The sum of an number and its additive inverse is zero.
There is only one number that is equal to 50. The number is 50.
78