Exploring Prime Numbers and Divisibility Rules

The video tutorial explains how to identify prime numbers using divisibility rules and math facts. It provides examples of non-prime numbers like 81, 65, and 9, demonstrating why they are not prime. The process of elimination is used to determine that 37 is a prime number. The tutorial encourages using additional resources for further understanding of prime numbers.

What is the main topic of the problem introduced in the video?

• Solving quadratic equations

• Identifying prime numbers

• Finding the greatest common divisor

• Calculating percentages

Which of the following numbers is not a prime number because it is divisible by 3 and 9?

• 37

• 81

• 2

• 65

Tags

CCSS.4.OA.B.4

Why is 81 not considered a prime number?

• It is an even number

• It ends in a 5

• The sum of its digits is divisible by 3

• It is less than 10

Tags

CCSS.4.OA.B.4

Which number is not a prime number because it ends in a 5?

• 65

• 2

• 37

• 81

Tags

CCSS.4.OA.B.4

Why are all even numbers except 2 not considered prime numbers?

• They are greater than 10

• They are divisible by 2

• They are odd numbers

• They end in 5

Tags

CCSS.4.OA.B.4

Which of the following numbers is not a prime number because it has more than two factors?

• 9

• 37

• 65

• 81

Tags

CCSS.4.OA.B.4

What is the correct answer to the problem presented in the video?

• 81

• 65

• 9

• 37

Tags

CCSS.1.NBT.C.4

CCSS.2.NBT.B.5

What should you use to figure out prime numbers according to the video?

• Multiplication tables

• Divisibility rules and math facts

• Geometry formulas

• Algebraic expressions

Tags

CCSS.4.OA.B.4

Where can you find additional resources if you need more review on prime numbers?

• In the library

• In the video or hint provided

• In the textbook

• In the practice problems

Tags

CCSS.4.OA.B.4

What should you do if you encounter a practice problem related to prime numbers?

• Ask a friend for help

• Watch the review video above the problem

• Guess the answer

• Skip the problem

Tags

CCSS.4.OA.B.4