Changes

The definition, agreement, and practical use of units of measurement have played a crucial role in human endeavour from early ages up to this day. Different systems of units used to be very common. Now there is a global standard, the International System of Units (SI), the modern form of the metric system.

The definition, agreement, and practical use of units of measurement have played a crucial role in human endeavour from early ages up to this day. Different systems of units used to be very common. Now there is a global standard, the International System of Units (SI), the modern form of the metric system.

===Activity No # Hands-on activity in standard measuring instruments ===

===Activity No # 1.Hands-on activity in using standard measuring instruments ===

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{| style="height:10px; float:right; align:center;"

|<div style="width:150px;border:none; border-radius:10px;box-shadow: 5px 5px 5px #888888; background:#f5f5f5; vertical-align:top; text-align:center; padding:5px;">

|<div style="width:150px;border:none; border-radius:10px;box-shadow: 5px 5px 5px #888888; background:#f5f5f5; vertical-align:top; text-align:center; padding:5px;">

#  Write a note on why standard measuring units are very important.

#  Write a note on why standard measuring units are very important.

===Activity No # Hunting treasure and measuring===

===Activity No # 2. Hunting treasure and measuring===

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{| style="height:10px; float:right; align:center;"

|<div style="width:150px;border:none; border-radius:10px;box-shadow: 5px 5px 5px #888888; background:#f5f5f5; vertical-align:top; text-align:center; padding:5px;">

|<div style="width:150px;border:none; border-radius:10px;box-shadow: 5px 5px 5px #888888; background:#f5f5f5; vertical-align:top; text-align:center; padding:5px;">

*Question Corner

*Question Corner

==Concept #4. Scale drawing==

==Concept # 4. Scale drawing==

===Learning objectives===

===Learning objectives===

# The students should comprehend that a Scale drawing is a drawing that shows a real object with accurate sizes except they have all been reduced or enlarged by a certain amount (called the scale).

# A Scale drawing is a drawing that shows a real object with accurate sizes except they have all been reduced or enlarged by a certain amount (called the scale).

# Since it is not always possible to draw on paper the actual size of real-life objects such as the real size of a car, an airplane, we need scale drawings to represent the size.

# Since it is not always possible to draw on paper the actual size of real-life objects such as the real size of a car, an airplane, we need scale drawings to represent the size.

# Drawing to scale is a tool that Engineers use for many different tasks. One key part of every scale drawing is the scaling factor. This number represents the degree to which our scale drawing or scale model has been reduced in size when compared to the original.  

# Drawing to scale is a tool that Engineers use for many different tasks. One key part of every scale drawing is the scaling factor. This number represents the degree to which our scale drawing or scale model has been reduced in size when compared to the original.  

===Notes for teachers===

===Notes for teachers===

===Activity No # Representing distances on paper-Introduction to scale drawing ===

===Activity No # 1. Representing distances on paper-Introduction to scale drawing ===

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{| style="height:10px; float:right; align:center;"

|<div style="width:150px;border:none; border-radius:10px;box-shadow: 5px 5px 5px #888888; background:#f5f5f5; vertical-align:top; text-align:center; padding:5px;">

|<div style="width:150px;border:none; border-radius:10px;box-shadow: 5px 5px 5px #888888; background:#f5f5f5; vertical-align:top; text-align:center; padding:5px;">

# Discuss the applications of scale drawing ?

# Discuss the applications of scale drawing ?

===Activity No # Estimating Tile costs===

===Activity No # 2. Estimating Tile costs===

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|<div style="width:150px;border:none; border-radius:10px;box-shadow: 5px 5px 5px #888888; background:#f5f5f5; vertical-align:top; text-align:center; padding:5px;">

# Students should be able to read and understand a scaling factor.  

# Students should be able to read and understand a scaling factor.  

# They should be able to find a scaling factor and create a scale drawing.

# They should be able to find a scaling factor and create a scale drawing.

*Multimedia resources

*Multimedia resources

*Website interactives/ links/ / Geogebra Applets

*Website interactives/ links/ / Geogebra Applets

*Process:

*Process:

# In the above blue print each individual unit is 4 feet.

# In the above blue print each individual unit is 4 feet.

# Each ceramic tile costs Rs 80 per square foot.

# Each ceramic tile costs Rs 80 per square foot.

# How much would it cost to tile the bathroom ?

# How much would it cost to tile the bathroom ?

# What is the scale factor here.

# What is the scale factor here.

*Evaluation:

*Evaluation:

# What are the actual dimensions of each room ?

# What are the actual dimensions of each room ?

*Question Corner:

*Question Corner:

# What all factors do you need to know to estimate the painting costs for each of the rooms.

# What all factors do you need to know to estimate the painting costs for each of the rooms.

# How would you go about the calculations.

# Write down the sequential steps for the calculations.

= Hints for difficult problems =

= Hints for difficult problems =