Finding the value of three consecutive numbers adding up to 21 - Free Math Videos

The video tutorial explains the concept of consecutive numbers and integers, focusing on solving a problem involving three consecutive odd integers that add up to 21. The teacher introduces key terms, sets up an equation using a variable, and demonstrates how to solve it step-by-step, concluding with the solution: the numbers 5, 7, and 9.

What does it mean for numbers to be consecutive?

• They are all even numbers.

• They are all prime numbers.

• They follow one after another without gaps.

• They are all odd numbers.

Why can't decimals or fractions be considered integers?

• Because they are always even.

• Because they are always negative.

• Because they are always positive.

• Because they are not whole numbers.

What is the purpose of using a variable in solving the problem?

• To avoid using numbers altogether.

• To represent an unknown number.

• To represent a known number.

• To make the problem more complex.

How do you find the next consecutive odd number if the first is represented by X?

• Add 4 to X.

• Add 3 to X.

• Add 2 to X.

• Add 1 to X.

What are the three consecutive odd integers that add up to 21?

• 3, 5, 7

• 5, 7, 9

• 7, 9, 11

• 9, 11, 13