Subtraction and Visualization Techniques

This video tutorial covers a second-grade Go Math lesson on writing equations to represent subtraction. The teacher introduces the concept and demonstrates solving subtraction problems using pictorial references. Two example problems are discussed: one involving children riding bikes to school and another with children on a bus. The teacher emphasizes using visual aids like drawing pictures and tens and ones to help understand and solve the problems.

What is the main focus of the lesson in this video?

• Writing equations for addition

• Writing equations for subtraction

• Learning multiplication tables

• Understanding division

Why does the teacher prefer using pictures for word problems?

• To make the lesson longer

• To help visualize and understand the problem

• To avoid using numbers

• To make the problems more colorful

In the first example, how many children rode their bikes to school?

• 21

• 8

• 29

• 15

How many children were left with bikes at school after some rode home?

• 29

• 8

• 15

• 21

What equation represents the first problem about bikes?

• 29 + 8 = ?

• 8 + 29 = ?

• 29 - 8 = ?

• 8 - 29 = ?

How many children left the school on their bikes?

• 15

• 29

• 8

• 21

In the second example, how many children were initially on the bus?

• 32

• 21

• 24

• 8

How many children got off the bus in the second example?

• 32

• 24

• 8

• 21

What equation represents the second problem about the bus?

• 24 + 32 = ?

• 32 + 24 = ?

• 32 - 24 = ?

• 24 - 32 = ?

How many children were still on the bus after some got off?

• 8

• 24

• 21

• 32