Divisibility Rules and Concepts

The video tutorial covers various divisibility tests for numbers 2 through 15. It explains the conditions under which a number is divisible by another, using examples for each case. The tutorial includes tests for divisibility by 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, and 15, providing clear examples and explanations for each rule.

What is the basic requirement for a number to be divisible by another number?

• The number must be odd.

• The conditions for divisibility must be met.

• The number must be a prime number.

• The number must be even.

Which of the following numbers is divisible by 2?

• 51

• 73

• 37

• 44

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

• The number ends in 3.

• The number is odd.

• The sum of its digits is divisible by 3.

• The number is a multiple of 3.

Which of the following numbers is divisible by 4?

• 345

• 256

• 123

• 567

What is the rule for a number to be divisible by 5?

• It ends in 1 or 6.

• It ends in 0 or 5.

• It is a multiple of 5.

• It is an even number.

A number is divisible by 6 if it is divisible by which two numbers?

• 2 and 4

• 2 and 3

• 3 and 5

• 4 and 5

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

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

• Check if it ends in 7.

• Divide by 7 directly.

• Add the digits.

How do you determine if a number is divisible by 8?

• The last two digits form a number divisible by 8.

• The last three digits form a number divisible by 8.

• The number is a multiple of 8.

• The number ends in 8.

What is the rule for divisibility by 9?

• The number ends in 9.

• The number is odd.

• The sum of its digits is divisible by 9.

• The number is a multiple of 9.

Which of the following numbers is divisible by 10?

• 1234

• 1123

• 5678

• 9100