Forgetting to use the conversion factor

Oct 13, 2025 by talynt.org 31 views

Understanding the Conversion Factor

In the world of mathematics, conversions between different units of measurement are a crucial aspect of problem-solving. One such conversion is between miles and kilometres, where 1 kilometre is equal to $$\frac{5}{8}$$ mile. This conversion factor is essential in solving problems that involve distances measured in both units.

The Problem: Converting 240 Miles to Kilometres

Given that 1 kilometre is equal to $$\frac{5}{8}$$ mile, we are tasked with finding the number of kilometres equivalent to 240 miles. To solve this problem, we can use the conversion factor to set up a proportion.

Setting Up the Proportion

Let's denote the number of kilometres as $$x$$. We can set up the following proportion:

\frac{1 \text{ km}}{\frac{5}{8} \text{ mile}} = \frac{x \text{ km}}{240 \text{ mile}}

Solving the Proportion

To solve for $$x$$, we can cross-multiply:

1 \cdot 240 = \frac{5}{8} \cdot x

240 = \frac{5}{8}x

Isolating the Variable

To isolate $$x$$, we can multiply both sides of the equation by $$\frac{8}{5}$$:

x = 240 \cdot \frac{8}{5}

Evaluating the Expression

Now, let's evaluate the expression:

x = 240 \cdot \frac{8}{5}

x = 384

Conclusion

Therefore, 240 miles is equivalent to 384 kilometres.

Real-World Applications

Converting miles to kilometres is an essential skill in various fields, such as:

Aviation: Pilots need to convert distances between different units to navigate safely.
Transportation: Drivers need to convert distances to ensure they are following speed limits and road signs.
Science: Scientists need to convert distances to analyze data and make accurate conclusions.

Tips and Tricks

When converting miles to kilometres, remember to:

Use the conversion factor: 1 kilometre is equal to $$\frac{5}{8}$$ mile.
Set up a proportion: Use the conversion factor to set up a proportion.
Solve for the variable: Isolate the variable by multiplying both sides of the equation by the reciprocal of the coefficient.

Common Mistakes

When converting miles to kilometres, avoid making the following mistakes:

Forgetting to use the conversion factor: Failing to use the conversion factor can lead to incorrect answers.
Not setting up a proportion: Failing to set up a proportion can lead to incorrect answers.
Not isolating the variable: Failing to isolate the variable can lead to incorrect answers.

Conclusion

Converting miles to kilometres is a crucial skill in mathematics and real-world applications. By using the conversion factor, setting up a proportion, and solving for the variable, we can accurately convert distances between different units. Remember to use the conversion factor, set up a proportion, and solve for the variable to avoid common mistakes.

Q: What is the conversion factor between miles and kilometres?

A: The conversion factor between miles and kilometres is 1 kilometre = $$\frac{5}{8}$$ mile.

Q: How do I convert miles to kilometres?

A: To convert miles to kilometres, you can use the conversion factor to set up a proportion. Let's denote the number of kilometres as $$x$$. We can set up the following proportion:

\frac{1 \text{ km}}{\frac{5}{8} \text{ mile}} = \frac{x \text{ km}}{y \text{ mile}}

Q: What is the formula to convert miles to kilometres?

A: The formula to convert miles to kilometres is:

x = y \cdot \frac{5}{8}

Q: How do I convert 100 miles to kilometres?

A: To convert 100 miles to kilometres, we can use the formula:

x = 100 \cdot \frac{5}{8}

x = 62.5

Q: How do I convert 500 miles to kilometres?

A: To convert 500 miles to kilometres, we can use the formula:

x = 500 \cdot \frac{5}{8}

x = 312.5

Q: What is the difference between miles and kilometres?

A: Miles and kilometres are two different units of measurement for distance. Miles are commonly used in the United States, while kilometres are commonly used in most other countries.

Q: Why is it important to convert miles to kilometres?

A: Converting miles to kilometres is important in various fields, such as aviation, transportation, and science. It ensures that distances are measured accurately and consistently.

Q: Can I use a calculator to convert miles to kilometres?

A: Yes, you can use a calculator to convert miles to kilometres. Simply enter the number of miles and multiply it by $$\frac{5}{8}$$.

Q: What are some common mistakes to avoid when converting miles to kilometres?

A: Some common mistakes to avoid when converting miles to kilometres include:

Forgetting to use the conversion factor: Failing to use the conversion factor can lead to incorrect answers.
Not setting up a proportion: Failing to set up a proportion can lead to incorrect answers.
Not isolating the variable: Failing to isolate the variable can lead to incorrect answers.

Q: Can I convert kilometres to miles?

A: Yes, you can convert kilometres to miles by using the conversion factor. The conversion factor is 1 mile = $$\frac{8}{5}$$ kilometre.

Q: How do I convert 100 kilometres to miles?

A: To convert 100 kilometres to miles, we can use the formula:

x = 100 \cdot \frac{8}{5}

x = 160

Q: How do I convert 500 kilometres to miles?

A: To convert 500 kilometres to miles, we can use the formula:

x = 500 \cdot \frac{8}{5}

x = 800