Cross Multiplying Fractions Explained

The video tutorial explains how to determine which fraction is larger by using visual aids and cross multiplication. It starts by discussing the use of pictures to compare simple fractions like one-third and one-half. The tutorial then highlights the challenges of using visual methods for fractions with larger denominators, such as 5/7 and 8/11. To address this, the video introduces the cross multiplication method, which involves multiplying diagonally across fractions to determine which is larger. The tutorial concludes by encouraging viewers to practice this method.

Which fraction is visually larger, 1/3 or 1/2?

• Cannot be determined visually

• Both are equal

• 1/2

• 1/3

Tags

CCSS.3.NF.A.3D

Why might it be difficult to compare fractions with larger denominators visually?

• It's easier than smaller denominators

• Pieces might not be exact

• All visual comparisons are easy

• Because it's hard to draw

Tags

CCSS.4.NF.A.2

What method is introduced to compare fractions with larger denominators?

• Addition

• Cross multiplication

• Subtraction

• Division

Tags

CCSS.4.NF.A.2

In cross multiplication, where do you start multiplying?

• Top number

• Bottom number

• With the larger fraction

• Any number

Tags

CCSS.3.NF.A.1

CCSS.3.NF.A.2B

What is the first step in cross multiplication?

• Multiply the denominators

• Start at the top numerator and go diagonal

• Start at the bottom denominator and go diagonal

• Multiply the numerators

Tags

CCSS.7.EE.B.3

What do you do after cross multiplying the denominators and numerators?

• Divide the results

• Compare the results

• Subtract the results

• Add the results

Tags

CCSS.4.NF.A.2

Which is larger, 5/7 or 8/11, based on cross multiplication?

• Cannot be determined

• Both are equal

• 8/11

• 5/7

Tags

CCSS.4.NF.A.2

After cross multiplying, what indicates the larger fraction?

• The higher sum

• The lower product

• The lower sum

• The higher product

Tags

CCSS.4.NF.A.2

What symbol is used to indicate the larger fraction?

• Circle around it

• Alligator mouth open towards it

• Minus sign

• Plus sign

Tags

CCSS.4.NF.A.2

Why is cross multiplication a reliable method for comparing fractions?

• It's faster than adding

• It provides an exact comparison

• It's easier than subtracting

• It requires less drawing

Tags

CCSS.4.NF.A.2