# Commercial Arithmetic

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# Textbook

Karnataka state textbook- Chapter 4: Commercial Arithmetic

# Additional Information

This videos is related to ratio and proportion and also profit and loss percentage

## Useful websites

1. To see the best videos on ratio and proportion click here
2. To get the information about simple interest click here
3. This TESS- India link to a unit on Proportional reasoning attempts to explore ways to teach proportional reasoning, including inverse and direct proportion in a creative way.

## Reference Books

NCERT textbook_Class 8-Chapter 8:Comparing quantities

National Institute of Open Schooling (NIOS)-Module 2 Commercial Mathematics:Percentage and its applications

# Teaching Outlines

## Concept #

### Notes for teachers

These are short notes that the teacher wants to share about the concept, any locally relevant information, specific instructions on what kind of methodology used and common misconceptions/mistakes.

### Activity No #

• Estimated Time
• Materials/ Resources needed
• Prerequisites/Instructions, if any
• Multimedia resources
• Website interactives/ links/ Geogebra Applets
• Process (How to do the activity)
• Developmental Questions (What discussion questions)
• Evaluation (Questions for assessment of the child)
• Question Corner

### Activity No #

• Estimated Time
• Materials/ Resources needed
• Prerequisites/Instructions, if any
• Multimedia resources
• Website interactives/ links/ Geogebra Applets
• Process (How to do the activity)
• Developmental Questions (What discussion questions)
• Evaluation (Questions for assessment of the child)
• Question Corner

## Concept #

### Notes for teachers

These are short notes that the teacher wants to share about the concept, any locally relevant information, specific instructions on what kind of methodology used and common misconceptions/mistakes.

### Activity No #

• Estimated Time
• Materials/ Resources needed
• Prerequisites/Instructions, if any
• Multimedia resources
• Website interactives/ links/ Geogebra Applets
• Process (How to do the activity)
• Developmental Questions (What discussion questions)
• Evaluation (Questions for assessment of the child)
• Question Corner

### Activity No #

• Estimated Time
• Materials/ Resources needed
• Prerequisites/Instructions, if any
• Multimedia resources
• Website interactives/ links/ Geogebra Applets
• Process (How to do the activity)
• Developmental Questions (What discussion questions)
• Evaluation (Questions for assessment of the child)
• Question Corner

# Project Ideas

• This website suggests some interesting activities such as 'raising funds for a cause', 'tracking spendings and earnings for a time period' and 'business' that could be used while teaching profit and loss. Click here
• Using a list of prices for food and clothing, which appear in advertisement leaflets/ pamphlets, students will practice math skills related to sales tax, discounts, percentages etc. Click here

# Math Fun

Usage

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