翻译“在我很小时我就对数学非常感兴趣”

I have been very interested in maths since I was (a) little boy (girl).
I became very interested in match since very young.
I have a keen intersted in math since my childhood.

请楼主酌情选用和搭配。
不能用过去式 i was interested,那样的话就等于说现在就没兴趣了

When I was young,I was interested in maths very much.

I was interested in math when I was very young.

翻译为：In my very early age I was very interested in mathematics

I had a great interest in Maths when I was a child.

I have been interested in maths since my childhood.