Question

The diameter of Mars is about 6.8 x 10^3 km. The diameter of Earth is about 1.2763 x 10^4 km. About how much greater is Earth's diameter than Mars?

Answer 1

Answer: $5.963\times10^3$ km

Step-by-step explanation:

Given : The diameter of Mars is about $6.8\times 10^3\ km$.

It can be rewrite as $6.8\times1000=6,800\ km$

[∵$10^3=10\times10\times10$]

The diameter of Earth is about $1.2763 \times 10^4\ km.$

It can be rewrite as $1.2763\times10000=12,763\ km$

[∵$10^4=10\times10\times10\times10$]

Clearly, 12,763> 6,800

Now, the difference in the diameter of Earth and Mars will be :-

$12763-6800=5963\ km$

Which can written as $5.963\times 1000=5.963\times10^3$

Hence, Earth's diameter is $5.963\times10^3$ km greater than Mars.

Answer 2

12,763 km - 6,800 km = 5,963 km or 5.963×10^3