Decimals

1) Hook: The Sweet Mango Story 🥭🍬

Raju bought 1 whole mango and half a mango from the market. He wanted to share the mangoes with his friends. But how can he write half as a number? 🤔

That's when his teacher said, "We use decimals to write parts of a whole!" Let's learn how decimals help Raju share his mangoes fairly! 🎉

2) Core Concepts: What Are Decimals? 🧮

A decimal is a way to show parts of a whole number using a dot called a decimal point.

Look at this number:

This number is 3.5, which means 3 whole parts and 5 tenths.

Decimals have place values like:

• Ones (whole numbers)
• Tenths (1 part out of 10)
• Hundredths (1 part out of 100)

Example:

This is 7.24, which means:

• 7 whole parts
• 2 tenths (2/10)
• 4 hundredths (4/100)

3) Key Formulas / Rules 📚

Example:

5.37 means 5 whole parts, 3 tenths, and 7 hundredths.

4) Did You Know? 🤩

Decimals help us in many things we use every day in India! 🇮🇳

• When you buy sweets like ladoo or barfi, the weight is often measured in decimals — like 2.5 kg!
• Fuel in vehicles is sold in decimals — like 5.75 litres of petrol.
• Even the famous Indian rupee has decimal parts called paise. 1 rupee = 100 paise (0.01 rupee)!

5) Exam Tips ✅

• Remember: The decimal point must not move when reading decimals.
• Write place values carefully — don’t confuse tenths with hundredths!
• Practice writing decimals from fractions like ½ = 0.5, ¼ = 0.25.
• Board exam questions often ask you to identify place values or write decimals in words.
• Watch out for common mistakes like writing 3.05 as "three point five" — it is "three point zero five".

Good luck! 🍀 Practice decimals with your favourite fruits or sweets at home!