What's the noun for remaining? Here's the word you're looking for.
remainder
A part or parts remaining after some has/have been removed.
(mathematics) The amount left over after subtracting the divisor as many times as possible from the dividend without producing a negative result. If n (dividend) and d (divisor) are integers, then n can always be expressed in the form n = dq + r, where q (quotient) and r (remainder) are also integers and 0 ≤ r < d.
“The tarantula holes always contained small, short-legged toads that apparently lived on the remains left over from the bounty provided by the huge spiders' nightly foraging.”
“The Island's Norse settlement was predated by the Celts, evidence for which comes in the form of archaeological remains of roundhouses and hill forts.”
“Later, his remains were disinterred and removed for permanent burial in France.”
remainderman
(law) A person entitled to receive a remainder interest in any property.
(law) A person entitled to the assets of a trust at the end of some specified period or after some event. For instance a man's will might put his assets into a trust with the income to go to his wife until she dies (being a life interest), at which time the capital (remainder interest) goes to their children. The children are remaindermen.
“A remainder vests if, at the time it is created, the remainderman exists and is ascertainable, and no condition need first occur to identify him.”
“And Romney as remainderman is not a function of mere circumstance, but an artifact of explicit calculation.”
“This statement is of great importance in common law since the property could, inter alia, be vested indefeasibly in a remainderman, i.e., a holder of a remainder estate.”
“The tarantula holes always contained small, short-legged toads that apparently lived on the remains left over from the bounty provided by the huge spiders' nightly foraging.”
“The Island's Norse settlement was predated by the Celts, evidence for which comes in the form of archaeological remains of roundhouses and hill forts.”
“Later, his remains were disinterred and removed for permanent burial in France.”