Today I happen to have an interesting discussion with a primary school kid.
I asked him "Which is the smallest one - digit integer?" He instantly replied $-1$. I told him that he's wrong and the answer is $-9$. He then replied then "why"? He constantly kept saying that $9$ is greater than $1$ and therefore, the smallest integer should also be -$1$. To him number with greater value is greater. He doesn't care about $+$ or $-$ sign.
I then explained things to him by drawing number line and then explained him that all the numbers to the right hand side of a particular number on the number line are greater. He then again asked "why?"
At the end I was speechless and couldn't satisfy his curiosity because I had no proper trick to put this into his brain. Kindly suggest me some methods to explain him everything he wants to know. I just want him to feel satisfied.