They are also called one. There are synonyms and mathematical terms: unit, or multiplicative identity but there is little advantage in using these terms.
When one of the numbers is a factor of the other.
additive inverses
Absolute value
Yes, if one of the numbers is a factor of the other.
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
There is only one number that is equal to 50. The number is 50.
78
The Two numbers are reciprocals of each number
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.