YOU SAID:

I have quite a firm grasp on the concept of numbers.

INTO JAPANESE

数字の概念にかなりのしっかりした把握があります。

BACK INTO ENGLISH

Pretty firm grasp on the concept of number.

INTO JAPANESE

数の概念をかなりしっかり把握。

BACK INTO ENGLISH

Concept of a number of fairly firm grasp.

INTO JAPANESE

かなりしっかり把握数の概念。

BACK INTO ENGLISH

It's pretty solid grasp of concepts.

INTO JAPANESE

それは概念のかなりしっかりと把握です。

BACK INTO ENGLISH

It is pretty firmly grasp the concept.

INTO JAPANESE

かなりしっかりと把握する概念です。

BACK INTO ENGLISH

It is pretty firmly grasp the concept.