1. The population of the city A is 10^-4 million, and the population of City B is 10^3 million. How many times more is the population of City A then the City B?

Question

2. A grain of rice has a volume 10^-9 m^3. A box is full of rice and has a volume of 10^-3 m^3. How many grains of rice are there in the box?

thankss

Answer 1

both questions are divisions,

1.
Your first question's data makes no sense.
10^-4 million = 1/10^4 million = 1000
The population of the city B
= 1000 million
= 1 Billion

No city has a population of 1 Billion !!!!

2. number of grains of rice
= 10^-3 / 10^-9
= 10^6 or 1 million grains of rice

Answer 2

10^-4 million = 10^-4 * 10^6 = 100