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Here are the facts I have been able to locate:

7,000 known asteroids

billions of estimated asteroids - sizes range from specs of dust to large hand sized objects

the 4 largest were once considered planets and account for 1/2 the total mass of the Asteroid Belt

- Ceres, with a diameter of 950 kilometers

- Vesta has a diameter of 530 kilometers

- Pallas has a diameter of 550 kilometers but is less massive than Vesta

- Hygiea is 500 by 350 kilometers

These 4 combine for a total diameter of 2,380 kilometers. If accounts for 1/2 the mass of the Asteroid Belt then when I add in the other 1/2 the total km would be 4,760 which is 1/4th the size of Earth's equatorial diameter (12,756 km). Which does not match to the original estimates where I have read the Asteroid Belt (combined) would be 4 times the size of Earth.

Where am I miscalculating? Thanks.