Determining Multiples of 4 and 7 Using Divisibility Rules

The video tutorial explains how to determine if a number is a multiple of 4 or 7 using divisibility rules. It begins with a basic introduction to divisibility, followed by detailed explanations of the rules for 4 and 7, including examples. The rule for 4 involves checking if the last two digits of a number are divisible by 4, while the rule for 7 is more complex, involving doubling the last digit and subtracting it from the rest of the number. The tutorial concludes with a recap of these rules.

What does it mean for a number to be divisible by another number?

• It can be divided evenly without a remainder.

• It can be divided with a remainder.

• It results in a decimal.

• It results in a fraction.

Which of the following numbers is a multiple of 4?

• 15

• 22

• 32

• 45

What is the key step in determining if a number is divisible by 4?

• Check if the number is odd.

• Check the last two digits of the number.

• Check if the number ends in 5.

• Check if the number is a multiple of 3.

How do you start checking if a number is divisible by 7?

• Double the last digit and subtract it from the rest of the number.

• Divide the number by 2.

• Add the digits together.

• Check if the number ends in 0.

What is the result when you subtract the doubled last digit from the rest of the number in the divisibility rule for 7?

• A multiple of 7

• A multiple of 2

• A multiple of 3

• A multiple of 5

Why is 85 not a multiple of 4?

• It is an even number.

• It ends in 5, which is not a multiple of 2.

• It is a multiple of 3.

• It ends in 0, which is a multiple of 4.

What have you learned in this lesson?

• How to add numbers efficiently.

• How to multiply numbers quickly.

• How to determine if a number is a multiple of 4 or 7 using divisibility rules.

• How to determine if a number is a multiple of 5.