This is the 4923rd most frequent Russian word.
количеством
"Количеством" translates to "by quantity" or "in terms of quantity" in English.
The word количеством refers to the quantity or amount of something.
Мы должны согласовать количество ингредиентов.
We must agree on the amount of ingredients.
Here, количеством is used to express a measurable quantity, in this case, time.
Он выделяется количеством затраченного времени на проект.
He stands out by the amount of time spent on the project.
The word количеством describes the numerical measure of books present.