Subtraction and Fact Families

This video tutorial covers subtraction combinations and fact families, demonstrating how related facts work with both single and two-digit numbers. Through various example problems, students learn to identify which numbers to subtract to achieve a specific difference. The video also includes a practical problem involving the alphabet to reinforce subtraction skills. The lesson concludes with a preview of the next chapter, which will focus on time and hours.

What is a fact family in mathematics?

• A group of related addition and subtraction facts

• A set of multiplication tables

• A series of geometric shapes

• A collection of prime numbers

Which of the following is an example of a two-digit fact family?

• 10 + 5 = 15 and 15 - 5 = 10

• 1 + 1 = 2 and 2 - 1 = 1

• 3 + 2 = 5 and 5 - 2 = 3

• 100 + 200 = 300 and 300 - 200 = 100

If you have the numbers 40, 70, and 50, which two numbers can you subtract to get 30?

• 70 and 50

• 70 and 40

• 40 and 70

• 50 and 40

How can you verify a subtraction result using addition?

• By subtracting the minuend from the subtrahend

• By adding the difference to the subtrahend

• By multiplying the difference by the minuend

• By dividing the subtrahend by the difference

What is the result of 75 minus 25?

• 55

• 40

• 60

• 50

Which two numbers from 75, 15, and 25 can be subtracted to get 50?

• 75 and 25

• 75 and 15

• 15 and 25

• 25 and 15

What is the result of 50 plus 25?

• 70

• 65

• 75

• 80

What is the result of 75 minus 15?

• 61

• 62

• 60

• 59

What is the result of 50 plus 25?

• 73

• 76

• 74

• 75

What is the result of 75 minus 15?

• 62

• 59

• 61

• 60