Basic Addition and Subtraction Facts

This grade three math lesson focuses on understanding addition and subtraction through the concept of fact families. The teacher explains how thinking of subtraction as reverse addition can simplify problems. Various examples are provided to illustrate these concepts, including simple addition techniques and the importance of memorizing math facts for quicker problem-solving. The lesson emphasizes the use of fact families to connect addition and subtraction, encouraging students to practice and memorize these relationships for better math proficiency.

What is the benefit of thinking about addition when solving subtraction problems?

• It helps in understanding multiplication.

• It simplifies the subtraction process.

• It is not beneficial at all.

• It makes subtraction problems harder.

If 9 - 4 = 5, which addition fact is part of the same fact family?

• 4 + 4 = 8

• 9 + 4 = 13

• 5 + 4 = 9

• 4 + 5 = 10

What is the result of 13 - 7?

• 7

• 6

• 8

• 5

Which of the following is a correct addition fact for 17 - 9?

• 9 + 9 = 18

• 8 + 9 = 17

• 7 + 9 = 15

• 9 + 7 = 16

What is the sum of 4 + 3?

• 9

• 6

• 7

• 8

How can you quickly add 2 + 7?

• Start with 2 and count up 7

• Add 2 and 7 in any order

• Subtract 2 from 7

• Start with 7 and count up 2

What is the result of 8 + 6?

• 15

• 12

• 13

• 14

What is the result of 9 + 4?

• 15

• 13

• 12

• 14

What is the result of 7 + 9?

• 15

• 16

• 17

• 18

What is the result of 8 - 5?

• 5

• 4

• 3

• 2