Understanding Proportions and Cross Multiplication

This video tutorial from MooMooMath and Science explains how to solve proportions using the butterfly technique, which involves cross multiplication. The instructor provides four examples, demonstrating how to find the value of x that makes each proportion true. Each example is followed by a verification step to ensure the solution is correct. The video concludes with a reminder about the importance of kindness.

What is the butterfly technique used for in solving proportions?

• To solve proportions using cross multiplication

• To find the average of two numbers

• To add two fractions

• To subtract two fractions

In the first example, what is the value of x when 3/5 = x/15?

• 10

• 7

• 8

• 9

What is the result of dividing 45 by 5 in the first example?

• 10

• 9

• 8

• 7

How do you solve for x in the equation 18x = 90?

• Add 18 to both sides

• Subtract 18 from both sides

• Multiply both sides by 18

• Divide both sides by 18

In the second example, what is the result of dividing 90 by 18?

• 7

• 6

• 5

• 4

What is the value of x in the equation 24x = 48?

• 2

• 4

• 1

• 3

What is the result of dividing 48 by 24 in the third example?

• 3

• 2

• 4

• 1

In the final example, what is the value of x when 16x = 80?

• 6

• 3

• 4

• 5

In the final example, what is the result of dividing 80 by 16?

• 4

• 5

• 7

• 6

What is the key message at the end of the video?

• Practice makes perfect

• Kindness multiplies kindness

• Always double-check your work

• Math is fun