Basic Addition and Subtraction Concepts

This video tutorial covers lesson 11 of module 4 for grade 1, focusing on number bonds and number sentences. It provides examples of addition and subtraction using visual aids like flowerpots and pizzas. The tutorial emphasizes understanding the relationship between parts and wholes in number bonds, and how to write number sentences in both unit and regular forms. The lesson concludes with exercises to reinforce the concepts taught.

What is the first step in the homework for Lesson 11?

• Solve a math problem

• Write your name

• Read a book

• Draw a picture

In the first example, how many flowerpots are shown?

• Four

• Five

• Two

• Three

What does each flowerpot represent in the example?

• 20 flowers

• 15 flowers

• 10 flowers

• 5 flowers

How is the number 30 represented in the example?

• Four groups of 10

• Three groups of 10

• Two groups of 15

• Three groups of 5

What is the importance of the equal sign in a number sentence?

• It shows subtraction

• It indicates the total

• It separates numbers

• It is not important

In a number sentence, where can the total be placed?

• Above the equal sign

• Either side of the equal sign

• Only on the right side

• Only on the left side

What happens when one of the tens is crossed out in a subtraction sentence?

• It adds to the total

• It is ignored

• It doubles the total

• It is subtracted from the total

How many tens are left after subtracting one ten from three tens?

• One ten

• Two tens

• Three tens

• Four tens

In the subtraction example with four tens, how many are crossed out?

• One ten

• Two tens

• Four tens

• Three tens

What is the whole number when four tens are crossed out completely?

• 40

• 30

• 20

• 10