numberness

Noun

uncountable

The quality of being a number. / (education) Competence in working with numbers and arithmetic; numeracy. / (mathematics) Cardinality.

Japanese Meaning

数であるという性質 / 数字や算数に関する能力（算数的理解） / 数学における基数（集合の大きさを表す概念）

The numberness of a concept determines whether it can participate in arithmetic operations.

概念が算術演算に参加できるかどうかは、その数である性質によって決まります。

Sense（1）

The quality of being a number.

Sense（2）

(education) Competence in working with numbers and arithmetic; numeracy.

Fluent reading and fluency in numberness are analogous.

Sense（3）

(mathematics) Cardinality.

It helps children to see that the numberness of a "set" can be represented by a numeral.