Divisibility Rules and Concepts

This video tutorial teaches how to determine if a whole number is a multiple of 2, 5, or 10 using divisibility rules. It explains the concept of divisibility, emphasizing the importance of no remainders. The tutorial covers specific rules for divisibility by 2, 5, and 10, using examples to illustrate each rule. By the end, viewers will understand how to quickly identify multiples using these rules.

What is a multiple of a number?

• A number that is always even.

• A number that is always odd.

• A number that cannot be divided by any other number.

• A number that can be divided by another number without a remainder.

Which of the following is a fact family for the number 10?

• 4, 8, 12

• 2, 5, 10

• 3, 6, 9

• 1, 2, 3

What does it mean if a number has a remainder when divided?

• The number is divisible.

• The number is not divisible.

• The number is a multiple.

• The number is a factor.

Which of the following numbers is divisible by 2?

• 57

• 45

• 36

• 23

What is the rule for a number to be divisible by 10?

• It must be an odd number.

• It must be a prime number.

• It must end in 0.

• It must end in 5.

Which of the following numbers is divisible by 10?

• 70

• 85

• 99

• 33

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

• It must end in 2 or 4.

• It must end in 0 or 5.

• It must be an even number.

• It must be a prime number.

Which of the following numbers is not divisible by 5?

• 100

• 30

• 73

• 95

Is the number 85 a multiple of 5?

• Yes, because it is a prime number.

• No, because it is an odd number.

• Yes, because it ends in 5.

• No, because it ends in 0.

What have you learned in this lesson?

• How to determine if a number is a multiple of 2, 5, or 10 using divisibility rules.

• How to multiply numbers.

• How to add numbers quickly.

• How to subtract numbers.