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Concept Corner

Understand an idea instead of just memorising it. Every concept follows the same five steps, so it gets easier each time.

How each concept works

  1. One sentence. The big idea, in plain words.
  2. Think of it like. Link it to something you know.
  3. Step by step. Small steps, one at a time.
  4. Example. See it in real life.
  5. Check yourself. Test what you learned.

Concepts

Science · Ages 8 and up

Photosynthesis

In one sentence: Plants make their own food using sunlight, water and a gas called carbon dioxide.

Think of it like this: Think of a leaf as a tiny kitchen. Sunlight is the energy for the stove, water and carbon dioxide are the ingredients, and the dish that comes out is sugar, the plant's food.

Step by step

  1. The roots take in water from the soil.
  2. The leaves take in carbon dioxide from the air through tiny holes.
  3. A green material in the leaves, called chlorophyll, catches sunlight.
  4. The plant uses that energy to turn water and carbon dioxide into sugar, and it releases oxygen.

Example: Plants and tiny sea algae release much of the oxygen in the air we breathe. That is one big reason to protect forests and oceans.

Remember: Sunlight + water + carbon dioxide gives sugar + oxygen.

Check yourself

Which gas do plants release during photosynthesis?

Science · Ages 9 and up

Why we have seasons

In one sentence: Seasons happen because the Earth is tilted as it travels around the Sun, not because it moves closer or farther away.

Think of it like this: Shine a torch on a tilted ball. The part leaning towards the torch gets strong, direct light and is warm. The part leaning away gets weaker light and is cooler.

Step by step

  1. The Earth's axis is tilted by about 23.5 degrees.
  2. As the Earth goes around the Sun in one year, the tilt keeps pointing the same way in space.
  3. When the northern half leans towards the Sun, it has summer and long days, while the southern half has winter.
  4. Six months later it is the other way round.

Example: This is why December is summer in Australia but winter in the north.

Remember: Tilt, not distance, makes the seasons.

Check yourself

What causes the seasons?

Science · Ages 7 and up

The water cycle

In one sentence: Water keeps moving between the sea, the air and the land, over and over.

Think of it like this: Watch a boiling kettle. Water turns into steam, the steam touches a cool lid and turns back into drops, and the drops fall. The water cycle is the same story on a giant scale.

Step by step

  1. Evaporation: the Sun warms water in seas, rivers and lakes, and it rises into the air as vapour.
  2. Condensation: high in the cool air, the vapour turns into tiny droplets and forms clouds.
  3. Precipitation: the droplets join together and fall as rain, snow or hail.
  4. Collection: the water flows into rivers, soaks into the ground and runs back to the sea.

Example: Rain that falls on you today may have been part of the sea some time ago.

Remember: Evaporation, condensation, precipitation, collection.

Check yourself

Which step of the water cycle forms clouds?

Science · Ages 9 and up

Electric circuits

In one sentence: Electricity flows only around a complete loop, called a circuit.

Think of it like this: Imagine water flowing around a ring of pipes. The pump is the battery, the pipes are the wires, and a switch is a gate that can close the pipe.

Step by step

  1. A battery pushes electric charge around.
  2. Wires carry it to a bulb and back to the battery, making a loop.
  3. A closed switch completes the loop, so the bulb is on.
  4. An open switch leaves a gap in the loop, so the bulb is off.

Example: When you flick a light switch off, you are making a gap in the circuit.

Remember: No complete loop, no current.

Check yourself

A bulb is connected to a battery, but the switch is open. What happens?

Maths · Ages 7 and up

Fractions

In one sentence: A fraction tells us how many equal parts we have out of the whole.

Think of it like this: Picture a pizza cut into 8 equal slices. If you eat 3 slices, you have eaten 3 out of 8 parts, which we write as 3/8.

Step by step

  1. Count the equal parts the whole is cut into. That is the bottom number (the denominator).
  2. Count the parts you are talking about. That is the top number (the numerator).
  3. Write the top number over the bottom number.

Example: If you eat 2 of the 8 slices, you ate 2/8. That is the same as 1/4, because 2 slices is a quarter of 8.

Remember: The parts must be equal.

Check yourself

A chocolate bar has 10 equal pieces and you eat 4. What fraction did you eat?

Maths · Ages 10 and up

Percentages

In one sentence: A percentage is a fraction out of 100. "Per cent" means "for every hundred".

Think of it like this: Imagine 100 small boxes. If 25 of them are filled, that is 25%.

Step by step

  1. Write the percentage as a fraction out of 100: 25% is 25/100.
  2. Simplify if you can: 25/100 is the same as 1/4.
  3. Take that fraction of the number: one quarter of 80 is 20.

Example: A 10% discount on a price of 200 rupees saves 20 rupees, because 10% is one tenth and 200 divided by 10 is 20.

Remember: 50% is a half, 25% is a quarter and 10% is a tenth.

Check yourself

What is 50% of 60?

English · Ages 7 and up

Nouns, verbs and adjectives

In one sentence: Every word in a sentence has a job. Nouns name things, verbs show action, and adjectives describe.

Think of it like this: A sentence is like a team. The noun is the player, the verb is what the player does, and the adjective tells us what kind of player it is.

Step by step

  1. Noun: a person, place or thing, such as teacher, Delhi or book.
  2. Verb: an action or state, such as run, read or is.
  3. Adjective: a word that describes a noun, such as tall, red or kind.

Example: In "The kind teacher reads a book", the nouns are teacher and book, the verb is reads, and the adjective is kind.

Remember: Nouns name, verbs do, adjectives describe.

Check yourself

In the sentence "The tall boy runs fast", which word is the verb?

Life skills · Ages 8 and up

Needs, wants and saving

In one sentence: A need is something you must have to live and stay healthy. A want is nice to have, but you can live without it.

Think of it like this: Think of your school bag. Books and a water bottle are needs. Fancy stickers are wants.

Step by step

  1. Write down the money you get and what you spend it on.
  2. Pay for your needs first.
  3. Put a small amount aside before you spend on wants.
  4. Wait a few days before buying a want, and see whether you still want it.

Example: Food, clean water, a home, medicine and education are needs. A new toy or game is a want.

Remember: Needs first, then save a little, then wants.

Check yourself

Which of these is a need?

Make it stick

  • After reading, close the page and explain the idea out loud in your own words.
  • Come back tomorrow and try the check again. Remembering after a gap builds strong memory.
  • Use the focus timer for 25 minutes of study, then take a short break.
  • Practise with the education games.