Subtracting Fractions | Summary and Q&A

TL;DR

Learn how to subtract fractions through step-by-step examples and two different methods, with a focus on finding common denominators.

Key Insights

• 😵 Subtracting fractions requires finding a common denominator or using cross-multiplication.
• ✖️ Cross-multiplication involves multiplying the denominators and numerators separately.
• 👻 Finding a common denominator allows for easier subtraction and combining of fractions.
• 🛩️ The least common multiple is the smallest number that can be divided evenly by all the denominators.
• 🧑‍🏭 Multiplying each fraction by the appropriate factor can convert them to have the same denominator.
• ❓ Subtracting three fractions follows a similar process of finding a common denominator and converting each fraction accordingly.
• ✖️ Accuracy in multiplication and subtraction is crucial for obtaining the correct result.

Transcript

in this lesson we're going to focus on how to subtract two or three fractions so let's start with this example three over five minus one over two how can we subtract those two fractions the first thing we need to do is multiply the two denominators of the fractions five times two is ten and then we need to cross multiply three times two is six five... Read More

Questions & Answers

Q: How can you subtract fractions with different denominators?

To subtract fractions with different denominators, you need to find a common denominator by multiplying the denominators together. Then, cross-multiply the numerators and subtract them to find the result.

Q: Why is finding a common denominator important?

Finding a common denominator allows you to combine fractions with different denominators into one fraction. It ensures that the fractions have the same base, making subtraction possible.

Q: What is the other method for subtracting fractions?

The other method involves finding a common denominator before subtracting the fractions. This method requires multiplying each fraction by a factor that will make their denominators the same. Then, you can subtract the numerators directly.

Q: How do you subtract three fractions?

To subtract three fractions, you need to find a common denominator among all three fractions. Then, convert each fraction to have the common denominator by multiplying the numerator and denominator appropriately. Finally, subtract the numerators.

Summary & Key Takeaways

• The lesson focuses on subtracting fractions and provides step-by-step instructions for two examples.

• One method involves multiplying the denominators and cross-multiplying the numerators, while the other method requires finding common denominators.

• The lesson also includes examples of subtracting three fractions and provides guidance on finding the least common multiple.