Understanding Factors and Multiples

Sal Khan and Ben Eater explore finding factors of numbers using dot arrangements. They start with 9, demonstrating how to rearrange dots to find factors like 3 and 1. They emphasize not repeating factors and check their answers. They then move to 16, identifying factors such as 2, 8, and 4, using similar methods. The video highlights understanding factors through visual manipulation of dots.

What is the purpose of resizing the box with 9 dots in the exercise?

• To count the number of dots

• To make the dots disappear

• To find the factors of 9

• To change the color of the dots

How can you arrange 9 dots to find a factor of 9?

• In a single line

• In 2 rows of 4 dots

• In 3 rows of 3 dots

• In a circle

Why should the factor 3 be written only once when listing factors of 9?

• Because it is the largest factor

• Because it is the smallest factor

• Because writing it twice is incorrect

• Because it is not a factor

Which of the following is NOT a factor of 9?

• 1

• 3

• 9

• 2

What is the first step in finding factors of 16 using the dot method?

• Resize the box

• Remove some dots

• Color the dots

• Count the dots

Which pair of numbers are factors of 16?

• 5 and 10

• 7 and 9

• 2 and 8

• 3 and 5

How can you verify that 2 and 8 are factors of 16?

• By multiplying them

• By dividing 16 by each number

• By subtracting them from 16

• By adding them together

What is the significance of finding 4 times 4 in the exercise?

• It shows 16 is not divisible by 4

• It is an incorrect arrangement

• It confirms 4 is a factor

• It shows 4 is not a factor

Which of the following is a correct factor pair of 16?

• 3 and 6

• 5 and 11

• 4 and 4

• 1 and 15

What is the final step in verifying the factors of 16?

• Adding more dots

• Checking the answer

• Removing some factors

• Rearranging the dots