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.
They are called twins.
Because exponent is the same as power.
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.
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.
They are called isotopes.
There are 900 of them.
300
Two atoms with the same number of protons but different numbers of neutrons are called "isotopes".
Five babies born at the same time are called 'quintuplets'. They are also called 'rare'.
These atoms are called isotopes.
Atoms of the same element cannot have different numbers of protons. Different numbers of protons mean different elements. An atom with the a different number of neutrons is called an isotope.