This is the 1074th most frequent Japanese word.
残り
"Remaining" or "leftover."
Used to indicate leftover or remaining portion of something, specifically food in this case.
ケーキの残りは冷蔵庫に入れてあります。
The remaining cake is stored in the refrigerator.
Indicates the remaining quantity or amount, here referring to time left.
締切まで残り三日しかありません。
There are only three days left until the deadline.
Refers to the remaining portion or time left for an event or activity.