# SCIENTIFIC NOTATION WORD PROBLEMS WORKSHEET

Scientific Notation Word Problems Worksheet :

Worksheet given in this section will be much useful for the students who would like to practice problems solving word problems on scientific notation.

## Scientific Notation Word Problems Worksheet - Problems

Problem 1 :

The table below shows the population of the three largest countries in North America in 2011. Find the total population of these countries. Problem 2 :

When the Sun makes an orbit around the center of the Milky Way, it travels 2.025 x 1014 kilometers. The orbit takes 225 million years. At what rate does the Sun travel? Write your answer in scientific notation.

Problem 3 :

Light travels at a speed of 1.86 x 105 miles per second. It takes light from the Sun about 4.8 x 103 seconds to reach Saturn. Find the approximate distance from the Sun to Saturn. Write your answer in scientific notation.

Problem 4 :

Light travels at the speed of 1.17 x 107 miles per minute. Pluto’s average distance from the Sun is 3,670,000,000 miles. On average, how long does it take sunlight to reach Pluto? Write your answer in scientific notation. ## Scientific Notation Word Problems Worksheet - Solutions

Problem 1 :

The table below shows the population of the three largest countries in North America in 2011. Find the total population of these countries. Solution :

Method 1 :

Step 1 :

First, write each population with the same power of 10.

United States : 3.1 x 108

Mexico : 1.1 x 108

Step 2 :

Add the multipliers for each population.

3.1 + 0.338 + 1.1  =  4.538

Step 3 :

Write the final answer in scientific notation :

4.538 x 108

Method 2 :

Step 1 :

First, write each number in standard notation.

United States : 310,000,000

Mexico : 110,000,000

Step 2 :

Find the sum of the numbers in standard notation.

310,000,000 + 33,800,000 + 110,000,000  =  453,800,000

Step 3 :

Write the final answer in scientific notation :

453,800,000  =  4.538 x 108

Problem 2 :

When the Sun makes an orbit around the center of the Milky Way, it travels 2.025 x 1014 kilometers. The orbit takes 225 million years. At what rate does the Sun travel? Write your answer in scientific notation.

Solution :

Key points :

The answer is the number of kilometers per year that the Sun travels around the Milky Way.

Set up a division problem using

Rate  =  Distance / Time

to represent the situation.

Step 1 :

Substitute the values from the problem into the Rate formula. Step 2 :

Write the expression for rate with years in scientific notation.

That is, 225 million  =  2.25 x 108.

Then, we have Step 3 :

Find the quotient by dividing the decimals and using the laws of exponents.

Divide the multipliers.

2.025 ÷  2.25  =  0.9

Divide the powers of 10.

1014 ÷ 108  =  1014-8

1014 ÷ 108  =  106

Step 4 :

Combine the answers to write the rate in scientific notation.

0.9 x 106  =  9.0 x 105

Justify and Evaluate : 9.0 x 105 is close 106so the answer is reasonable.

Problem 3 :

Light travels at a speed of 1.86 x 105 miles per second. It takes light from the Sun about 4.8 x 103 seconds to reach Saturn. Find the approximate distance from the Sun to Saturn. Write your answer in scientific notation.

Solution :

As we have solved question 2, we can solve get answer for this question using the formula for distance given below.

Distance  =  Speed x Time

Then, we will get the answer :

8.928 x 108 miles

Problem 4 :

Light travels at the speed of 1.17 x 107 miles per minute. Pluto’s average distance from the Sun is 3,670,000,000 miles. On average, how long does it take sunlight to reach Pluto? Write your answer in scientific notation.

Solution :

As we have solved question 2, we can solve get answer for this question using the formula for time given below.

Time   =  Distance / Speed

Then, we will get the answer :

3.14 x 102 minutes After having gone through the stuff given above, we hope that the students would have understood how to solve word [problems on scientific notation

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