Hi @RZ923,

You are totally right that the closest number that Prof. Loh can use to get the answer $$100$$ times $$2\pi$$ is $$628.$$ Actually, $$2\pi$$ is equal to $$2\times 3.14=6.28.$$

However, Prof. Loh didn't choose the number $$710$$ for the purpose of geting an answer that is close to $$100$$ (but it's still a good bonus). He did it for a different reason: to illustrate the integers $$710$$ and $$226,$$ which we can use to get the number that will be very close to $$\pi:$$ $$\frac{710}{226}=\frac{355}{113}={\color{darkred}3.14159292}\approx 3.141592654...= \pi.$$

But you have a great observation here! It's awesome! So, keep it up