Comparing and Ordering Rational Numbers

Mr. McCullum continues the lesson on comparing and ordering rational numbers. He reviews previous topics, introduces cross multiplication as a method to compare fractions, and solves a word problem involving percentages and fractions. The lesson progresses to ordering rational numbers from least to greatest, using decimals for easier comparison. The video concludes with a final example and instructions for homework.

What is a rational number?

• A number that is always negative

• A number that is always positive

• A number that cannot be expressed as a fraction

• A number that can be expressed as a fraction

What is the least common denominator (LCD)?

• The smallest number that is a multiple of the denominators of two or more fractions

• The largest number that is a multiple of the denominators of two or more fractions

• The smallest number that is a factor of the numerators of two or more fractions

• The largest number that is a factor of the numerators of two or more fractions

How do you compare two fractions using cross multiplication?

• Multiply the numerator of the first fraction by the denominator of the second fraction and vice versa

• Add the numerators of both fractions

• Multiply the denominators of both fractions

• Subtract the numerators of both fractions

Which fraction is greater: 1/5 or 7/50?

• 1/5

• 7/50

• They are equal

• Cannot be determined

In Mr. Wang's class, what percentage of students own roller shoes?

• 5%

• 29%

• 50%

• 20%

How do you convert a percentage to a decimal?

• Subtract 100

• Divide by 100

• Multiply by 100

• Add 100

Which is larger: 20% or 5/29?

• 5/29

• 20%

• Cannot be determined

• They are equal

What is the value of pi up to four decimal places?

• 3.1415

• 3.1444

• 3.1416

• 3.4444

How do you order a set of rational numbers from least to greatest?

• Compare the numerators only

• Compare the denominators only

• Convert all numbers to fractions and compare

• Convert all numbers to decimals and compare

What is the decimal equivalent of 3/5?

• 0.7

• 0.5

• 0.6

• 0.8