What kind of numbers are 10 30 50 70 and 90 called in math?

The numbers 10, 30, 50, 70, and 90 are called even numbers because they are all divisible by 2 without leaving a remainder. Additionally, they can be classified as multiples of 10, as each number can be expressed as 10 times a whole number (1, 3, 5, 7, and 9 respectively).