Finding the Least Common Denominator Made Easy

The video tutorial by Daniel from the Assessment Toolbox focuses on adding and subtracting fractions with different denominators. It explains the concepts of denominators and numerators, emphasizing the importance of simplifying fractions early to make calculations easier. The tutorial covers methods to find common denominators, including listing multiples and multiplying denominators, and provides examples to illustrate these techniques. The video encourages reducing fractions as early as possible to simplify the problem-solving process.

What is the term for the bottom number of a fraction?

• Dividend

• Quotient

• Denominator

• Numerator

Tags

CCSS.3.NF.A.1

CCSS.3.NF.A.2B

Why is it beneficial to reduce fractions as early as possible?

• It ensures the fractions are in their original form.

• It makes the numbers larger and easier to work with.

• It simplifies the problem and keeps the numbers smaller.

• It eliminates the need for finding a common denominator.

What is the least common denominator (LCD)?

• The smallest number that is a multiple of both denominators.

• The largest number that is a factor of both denominators.

• The smallest number that is a factor of both denominators.

• The largest number that is a multiple of both denominators.

When listing multiples to find a common denominator, what is the first step?

• Subtract the smaller denominator from the larger one.

• List the multiples of each denominator.

• Multiply the numerators together.

• Add the denominators together.

What is a potential downside of multiplying denominators to find a common denominator?

• It can create a larger number that requires more reduction.

• It simplifies the problem too much.

• It always results in the smallest possible denominator.

• It eliminates the need for reducing fractions.

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

Which method always works to find a common denominator but may not be the most efficient?

• Multiplying denominators

• Listing multiples

• Reducing fractions first

• Adding numerators

Tags

CCSS.7.NS.A.1C

In the example of 3/7 + 1/3, what is the least common denominator?

• 7

• 3

• 21

• 10

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2

What is the equivalent fraction of 1/8 with a denominator of 24?

• 1/24

• 3/24

• 8/24

• 24/24

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

In the final example, what is the equivalent fraction of 5/6 with a denominator of 24?

• 20/24

• 15/24

• 10/24

• 5/24

Tags

CCSS.3.NF.A.3B

CCSS.4.NF.A.1

What are the three key methods for adding fractions with different denominators?

• Reduce, list multiples, multiply denominators

• Simplify, factor, multiply

• Add, subtract, multiply

• Divide, multiply, add

Tags

CCSS.5.NF.A.1

CCSS.5.NF.A.2