Extension - Planetary Estimation

Which is greater, the diameter of Earth or the combined diameters of Mercury and Mars?
1. Earth
2. Mercury and Mars
3. Study
Estimate the combined diameters of all four planets.
1. 32,000 km
2. Study
Estimate the combined diameters of Venus and Earth.
1. 25,000
2. Study
Estimate the combined diameters of Venus and Mercury.
1. 17,000
2. Study
Rounding to the tens place, about how many more Earth days is a Venus day than a Mercury day?
1. 180
2. Study
Rounding to the hundreds place, about how many kilometers wider in diameter is Earth than Venus?
1. 700
2. Study
How much farther from the sun is Mars than Venus?
1. 100,000,000
2. Study
Rounding to the greatest place value, how much farther from the sun is Mars than Mercury?
1. 140,000,000
2. Study
(Round planetary distances to the nearest 10 million) The moon is about 384,000 km from Earth. About how much farther will astronauts travel when they visit Mars than the when we went to the Moon in the early nineteen seventies?
1. 79,600,000
2. Study
(Round planetary distances to the nearest 10 million) How far is Mars from Venus?
1. 120,000,000
2. Study
In the distant future, a certain astronaut rented a space ship and flew from Earth to visit his cousin in the space station that orbited Mercury. Then he zipped back to Mars to see his girl friend in the Martian Planetary Beauty Pageant. When he returned to Earth he returned the space craft to the rental agency. About how many km should he be charged for?
1. 340,000,000
2. Study
The circumference of a circle is found by multiplying the diameter x pi (3.14). Using 3 for pi and rounding to the greatest place value, about how many km is the circumference (equator) of Earth?
1. 30,000
2. Study
The circumference of a circle is found by multiplying the diameter x pi (3.14). Using 3 for pi and rounding to the greatest place value, about how many km is the circumference (equator) of Mars
1. 21,000
2. Study
3. 21000
The circumference of a circle is found by multiplying the diameter x pi (3.14). Using 3 for pi and rounding to the greatest place value, about how many more km would a trip around the equator of Earth be than a trip around the equator on Mercury?
1. 15,000
2. Study
Rounded to a favorable 10, a year on Earth is 360 days. How many days will Mercury have in one Earth year?
1. 6
2. Study
About how many Venetian orbits can fit inside of a Martian orbit?
1. 2
2. Study