The answer is "Magic Year" or "Magic Birthday". During that year, things are supposed to go especially well for you.
There are 900 of them.
In Real numbers, each is the additive inverse of the other.
Because exponent is the same as power.
They are called twins.
This is called the "commutative" property.
A number with the same last and middle numbers is called a palindrome. Palindromic numbers read the same forwards and backwards.
Equivalent numbers.
Palindromes
Opposite numbers.
They are called isotopes.
Related facts that use the same numbers are called a fact family. A fact family includes both addition and subtraction facts using the same set of numbers.
Two atoms with the same number of protons but different numbers of neutrons are called "isotopes".
There are 900 of them.
Isotopes are atoms of the same element with the same number of protons (atomic number) but different numbers of neutrons, resulting in different mass numbers.
300
These atoms are called isotopes.
Five babies born at the same time are called 'quintuplets'. They are also called 'rare'.