# NSO for Class 3 : Syllabus

## Grade 3 Syllabus for NSO

### Plants and Animals

Different parts of a plant and their functions

Animals

# IMO for Class 3 : Syllabus

Number sense

• Comparing numbers
• Abacus and place value
• Word problems

# Class 3 NSO : Soil types

## What is soil

Soil is formed by erosion that is breaking up of rocks , by the action of sun, wind and rain. It forms at the surface of land and  is the “skin of the earth.” Soil is capable of supporting plant life and is vital to life on earth.

Soil contains a lot of different things;  a few essential ingredients are listed below:

Sediment Every soil contains some mixture of sediments.  The three main sediments are sand, silt, and clay. The type of sediments  determines a soil’s typeIdeal soils (for farming) are a mixture of the three.

Organic Matter – Soil contains a lot of partially decomposed organisms which is called organic matter. Microbes in the soil break it down to make important nutrients. Most organic matter comes from plants. This is also called Humus and is dark brown or black in color.

Minerals – There are tons of different minerals in the soil. They’re used by plants for growth. When plants die, their minerals return to the Earth.

## Comparative & Superlative with -er/-est

We use -er / -est with the following adjectives:

cold colder coldest
cool cooler coolest
great greater greatest
hard harder hardest
high higher highest
low lower lowest
neat neater neatest
short shorter shortest
small smaller smallest
thick thicker thickest
weak weaker weakest

# Grade 3 Maths (IMO) : Division

Let’s talk about what division really is — it is repeated subtraction; much the way multiplication is repeated addition.

Let’s say I have the basic problem 16 ÷  4.  I could start with 16 and then subtract 4, subtract another 4, another 4, and another 4 until I run out and reach zero.  I would have to do this 4 times. If I had 16 cookies that I wanted to share equally among 4 friends, I could do the “one for you, one for you, one for you, and one for you” process and still end up with 4 cookies for each.

But what about 375 ÷ 50? If I don’t know how to divide by double digit numbers, the repeated subtraction process might actually be a good choice . . . at least showing some number sense to know that 375 divided by 50 means “How many 50’s in 375?” I know if I subtract 50 six times, I still have 75 left. I can subtract another 50 and I have 25 left over. So 375 ÷ 50 = 7 with a remainder of 25.

### Dividing using the distributive law

 Division Possible Split Calculation Answer 69 ÷ 3 60 + 9 (60 ÷ 3) = 20 (9 ÷ 3)  = 3 20 + 3 = 23 391 ÷ 3 390 + 1 (390 ÷ 3) = 130 (1 ÷ 3) = cannot be divided 130 with Remainder 1

## Long Division

Before a child is ready to learn long division, he/she has to know: Continue reading

# Grade 3 Science (NSO) : Food part 3 – Preservation of food

## Food Decay and Preservation

Bacteria and fungi are the main groups of  decomposer organisms. Food decay is also known as food spoilage.

Bacteria and fungi need Food , Warmth and Moisture to grow.

There are several ways to stop or slow down the decay of foods. This is known as Food Preservation.

## Food preservation methods

### Freezing

Bacteria cannot reproduce at low temperatures.

Bacteria and fungi need warmth to grow. In low temperatures they stop growing.

Following is the list of food preserved by freezing;

• Meat
• Fish
• Fruits
• Vegetables
• Fresh foods
• Cooked foods

### Drying

Removing water prevents the microorganisms from growing, or digesting the food.

# Grade 3 Science (NSO) : Food Part 1 – Food Types

A look at the grade 2 lesson

## Energy giving food

Give us energy to work. They contain carbohydrate and fats.

### Carbohydrates

They are found in foods like rice, pasta, cassava, yam etc. when starchy foods are eaten and digested, simple sugars like glucose are obtained. It is this glucose that the body uses for energy.

There are two major types of carbohydrates:

1. Simple carbohydrates (Sugar)

• Fruits
• Milk
• White sugar you would find in a sugar bowl
• Chocolates

# Grade 3 Science (NSO) : Birds

Bird, a warm-blooded vertebrate that lays eggs and has feathers and wings.

# Grade 2 Science (NSO) : Air and water

Before starting lets take a look at the Grade 1 lessons

Air and Water : Properties

Air and Water : Use

Activities: Worksheets on Air and Water

## Air

Living things need air to breathe

Moving air is called Wind

A gentle wind is called Breeze

A strong fast wind is called a Storm

A very strong wind is called Gale

### Uses of moving air

A weather cock or wind vane is used to know the direction of the wind. At airports we use wind sock to know the direction of the wind. When aeroplanes fly in the direction of the wind , it saves fuel.

Wind makes windmill work. They are used to generate wind energy which is used to grind grains, pump water and make electricity.

Helps in sailing boats

A parachute falls slowly because of the wind