Lesson 16: Bigger or Smaller

Many objects around us are in the shape of squares and rectangles.

How to differentiate these two biscuits?
Which shape do you think has a bigger area? square or rectangles?





Comparing areas of a square and a rectangle
For example : How many 1cm times 1cm squares are used to fill the 4cm times 4cm square and 8cm times 2cm rectangle?

 

Area = length times width                                    
        = 4cm times 4cm                                                  
        = 16 centimetre square 


      
Area = length times width
         = 8cm times 2cm
         = 16 centimetre square

Lesson 15: Measuring length

We can measure length by using different ways

1. By using different parts of the body
( A ) Arm span


( B ) Cubit


( C ) Foot



2. By using objects
( A ) Measuring tap



( B ) Straw


3. By using standard units
( A ) Millimetre -short length


( B ) Centimetre -short length


( C ) Kilometre -long length


( D ) Metre -long length

Lesson 14: Adaption to Nature

A desert is an example of a dry region


( A ) Cactus

• Needle shaped leaves so that less water is lost from plant
• Think stem to store water
• Long roots, deep into soil to get water

( B ) Coconut trees

• Leaves are divided so that they do not break easily
• Trees have a trunk that can sway with the wind
• Having a strong buttress roots so that they will know to uprooted bu strong winds

( C ) Mangrove tree

• Having a strong buttress roots so that they will know to uprooted bu strong winds
• Long roots, deep into soil to get water

Lesson 13: Natural Defense in Plants

Plants have specific characteristics to protect themselves from enemies.

( A ) Mimosa plants fold their leaflets when touched.



( B ) Papaya leaves produce latex to prevent them from 
        being eaten.



( C ) Pineapple plants and fruits have many sharp 
         thorns.



( D ) Bamboo plants have many fines hairs that may 
        causes itchiness .

Lesson 12: Survival

Animals have specific characteristics behaviours to protect them from enemies and extreme weather enable them to survive.

( A ) Armadillos 

• Find foods at night
• Curl their bodies onto a ball when they are attack by enemies
• Having hard scales to protect them against their enemies

( B ) Arctic foxes

• Able to survive changes in the weather
• fur is brown in summer but turns into white in winter
• This help them hide from their enemies

Lesson 11: Living in Extreme Weather

How animals live in such an extreme weather?

DURING HOT WEATHER...
( A ) Camel have humps on their backs to store food and water.

They can drink as much as 200 litres of water a day.

( B ) Rhinoceroses keep their bodies cool by wallowing in 

        mud holes

( C ) Desert foxes have long ears to lose heat easily

( D ) Kangaroo rats keep fats in their tails

When there is no water, the fat can be changed into water

( E ) Desert birds make holes in cactus plants

DURING COLD WEATHER...

( A ) Polar bears have think furs to enable them to live in very 

        cold whether

( B ) Penguins have think layers of fat under their skin to keep their bodies warm

( C ) Seals have think layers of fat to keep themselves 

        warm

( D ) Arctic foxes sleep during cold weather and cover 
        their bodies with their long tails

Lesson 10: Protection from Danger

How animals protect from danger?


( A ) Centipedes have venomous stings.



( B ) Millipedes curl up their bodies.


(C) Bed bugs are smelly to keep away their   
      enemies.           


( D ) Scorpions have stings.


( E ) Porcupines have sharp spines around their body.


( F ) Moths have two large spots on their wings which 
         looks like two eyes.


( G) Chameleons have the ability to change their body 
       colour similar to the background to confuse their 
       enemies. 


( H ) Pangolins have hard scales to protect their bodies from 
         being hurt.