Addition When Subtracting

The video tutorial introduces strategies for solving subtraction problems by using related facts. It explains that addition and subtraction are opposite operations and demonstrates how related addition facts can help solve subtraction problems. Several examples are provided to illustrate the concept, showing how to identify and use related facts effectively. The tutorial concludes by encouraging the use of this strategy to solve subtraction problems when the answer is not immediately known.

What is a strategy to solve subtraction problems when you don't know the answer?

• Use unrelated numbers

• Use division facts

• Use related addition facts

• Use multiplication facts

In the example 15 - 7, which addition fact helps find the missing number?

• 9 + 6 = 15

• 8 + 7 = 14

• 7 + 8 = 15

• 7 + 9 = 16

Which addition fact is related to the subtraction fact 16 - 7?

• 9 + 7 = 16

• 2 + 7 = 9

• 7 + 9 = 15

• 8 + 8 = 16

What is the missing number in the subtraction equation 17 - 9?

• 6

• 7

• 8

• 9

How can related facts help when you don't know a subtraction answer?

• By guessing the answer

• By using multiplication facts

• By using unrelated numbers

• By using related addition facts