Practice the questions of **McGraw Hill Math Grade 8 Answer Key PDF Lesson 10.8 Estimation and Comparison **to secure good marks & knowledge in the exams.

## McGraw-Hill Math Grade 8 Answer Key Lesson 10.8 Estimation and Comparison

**Exercises**

**Use this chart to answer the questions.**

Question 1.

Write each distance in the chart in scientific notation.

Answer:

Explanation:

Scientific notation is a way to make these numbers easier to work with.

In scientific notation, you move the decimal place until you have a number between 1 and 10.

Then you add a power of ten that tells how many places you moved the decimal.

In scientific notation, the distance between the sun and planet Mercury is 35,980,000 miles becomes 3.598 x 10^{7
}The distance between the sun and planet Venus is 65,240,000 miles becomes 9.296 x 10^{7
}The distance between the sun and planet Earth is 92,960,000 miles becomes 3.598 x 10^{7
}The distance between the sun and planet Mars is 141,600,000 miles becomes 1.416 x 10^{8
}The distance between the sun and planet Jupiter is 483,800,000 miles becomes 4.838 x 10^{8
}The distance between the sun and planet Saturn is 888,200,000 miles becomes 8.882 x 10^{9
}The distance between the sun and planet Uranus is 1,784,000,000 miles becomes 1.784 x 10^{9
}The distance between the sun and planet Neptune is 2,795,000,000 miles becomes 2.795 x 10^{9}

Question 2.

How many times larger is Uranus than Saturn?

Answer:

2 times larger

Explanation:

Distance of Uranus – 1784,000,000 = 17.84 x 10^{7}

Distance of Saturn – 888,200,000 = 8.882 x 10^{7
}8.8 x 2 = 17.6 2 times larger

Uranus is two timesÂ larger than Saturn.

Question 3.

How many times larger is Jupiter than Earth?

Answer:

5 times larger

Explanation:

Distance of Jupiter 483,800,000 = 48.38 x 10^{7}

Distance of Earth 92,960,000 = 9.296 x 10^{7
}9.296 x 5 = 46.48

Jupiter is 5 times larger times larger than Earth.

Question 4.

Estimate the distance from the Earth to the Sun in scientific notation.

Answer:

9 x 10^{7}

Explanation:

Distance of Earth 92,960,000 = 9 x 10^{7Â }

9 x 10^{7} the distance from the Earth to the Sun in scientific notation.