Divisibility Rules and Concepts

The video explores divisibility rules for numbers 1 through 9, providing tricks to determine if a number can be divided evenly by another. It emphasizes developing number sense and understanding the logic behind these tricks. The video also introduces the Curiosity Box, a product supporting Alzheimer's research.

What is the main purpose of practicing social distancing according to the video?

• To have more time for math

• To ensure public safety

• To make new friends

• To learn divisibility rules

Which numbers are easily checked for divisibility by their last digit?

• 3, 6, and 9

• 1, 2, and 5

• 4, 7, and 8

• 5, 7, and 9

How can you determine if a number is divisible by 3?

• Sum its digits and check if the sum is divisible by 3

• Subtract 3 from it and see if the result is zero

• Check if it ends in 3

• Multiply its digits and check if the product is divisible by 3

What is the relationship between the divisibility rules for 3 and 9?

• They are completely different

• They require a calculator

• Both involve checking the sum of the digits

• One is for even numbers, the other for odd

What two conditions must be met for a number to be divisible by 6?

• It must be a prime number

• It must end in 6 and be divisible by 2

• It must be even and divisible by 3

• It must be odd and divisible by 3

How can you check if a number is divisible by 4?

• Check if the sum of the digits is 4

• Check if the number is even

• Check if the last two digits form a number divisible by 4

• Check if the last digit is 4

What is the key difference in checking divisibility by 8 compared to 4?

• You check the last three digits for 8

• You only check the last digit for 8

• You multiply the number by 8

• You divide the number by 8

What is the first step in checking if a number is divisible by 7?

• Subtract 7 from the number

• Add all the digits

• Multiply the last digit by 5

• Divide the number by 7

Why does summing the digits help determine divisibility by 3?

• Because of the base-10 system and properties of 9

• Because the sum is always a multiple of 3

• Because 3 is a prime number

• Because it simplifies the number

What is the Calibron 12 puzzle?

• A riddle about numbers

• A game about social distancing

• A puzzle involving assembling pieces into a rectangle

• A math problem involving divisibility