Recalling Ratios And Percentages
Chapter Name : Comparing Quantities |
Sub Topic Code : 104_08_08_01_01 |
Topic Name : Recalling Ratios And Percentages |
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Sub Topic Name : Recalling Ratios And Percentages |
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Introduction
What is ratio? How is percentage calculated?
Pre-Requisites:
Basic knowledge about ratios
Activity:
Depending on the length of the building to be sketched, the student assumes various scales to each color crayon and sketches the building.
Real Life Question:
What is the quantity of a piece of pizza cut into 4 parts?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Ratio | Term used to relate one quantity with another quantity |
| Percentage | Term used to relate one quantity with the total quantity. |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Drawing charts, crayons | Sketch a building on the chart that is 100 meters high using different scales of length to different colored crayons. Find the ratio of different colors used to sketch in terms of scale and length of building. |
Real life uses :
Maps, blue prints, medicine dosages, economic predictions, gear constructions, scaling
Practical examples around us
| Examples | Explainations |
|---|---|
| Maps | The maps are drawn by assuming a scale and building the map in proportionate ratios. |
| Medicine dosage | The dosage depends on the body weight of the person and various proportions of medicine is administered depending on weight. |
What you learn in Theory:
Ratio is a comparison of two quantities while percentage is used to show ratio of a particular quantity with the whole quantity.
What you learn in Practice:
The height of the building is 100 meters. Different scales are assigned to different colors. The length is scaled such that using various crayons, we have to form the height of the building. The height represented by each color is represented in terms of percentage by comparing it with the total height.