Finding Unknown Numbers in Addition

The video tutorial explains how to find unknown numbers using related facts. It introduces the concept of related facts, which use the same numbers in different orders to solve for unknowns. Through multiple examples, the video demonstrates how to find unknown numbers by subtracting known parts from the whole. The tutorial emphasizes the relationship between addition and subtraction in solving these problems and encourages viewers to practice with various examples. The video concludes with a call to action to like and subscribe for more content.

What is the unknown number in the equation 3 + unknown = 11?

• 8

• 11

• 3

• 6

In an addition sentence, what represents the 'whole'?

• The difference

• The sum of the parts

• The first number

• The unknown number

How do you find a missing part in an addition sentence?

• Divide the whole by the known part

• Multiply the parts

• Subtract the known part from the whole

• Add the parts

Why is it important to understand the structure of an addition sentence?

• To perform subtraction

• To solve complex equations

• To memorize numbers

• To identify parts and wholes

What is the result of 13 - 6?

• 6

• 19

• 7

• 13

If 9 + unknown = 15, what is the unknown number?

• 15

• 24

• 6

• 9

In the equation unknown + 5 = 14, what does the unknown number equal?

• 19

• 5

• 9

• 10

What is the unknown number if 17 = unknown + 9?

• 17

• 9

• 26

• 8

How do related facts help in finding unknown numbers?

• By guessing

• By reversing the operation

• By adding more numbers

• By using division

What operation is primarily used to find unknown numbers in these examples?

• Division

• Subtraction

• Addition

• Multiplication