Mathematics Class 4 - Length Weight-Capacity-Time-And-Money Notes

Length, Weight, Capacity, Time and Money

Welcome to the chapter on Length, Weight, Capacity, Time and Money for Class 4. In this chapter, you will learn how to measure and compare length, weight, and capacity, tell time, and use money in daily life. By the end of this chapter, you will be able to solve problems using these measurements and understand their importance in everyday activities!

Introduction

We use measurements every day. We measure how long something is, how heavy it is, how much it can hold, what time it is, and how much money we need. Let’s learn about these important concepts!

Length

• Length tells us how long or tall something is.
• We use units like millimeter (mm), centimeter (cm), meter (m), and kilometer (km).
• We use a ruler or measuring tape to measure length.
• Example: The length of a pencil is 15 cm.

Weight

• Weight tells us how heavy something is.
• We use units like gram (g) and kilogram (kg).
• We use a weighing scale to measure weight.
• Example: The weight of a watermelon is 2 kg.

Capacity

• Capacity tells us how much a container can hold.
• We use units like milliliter (ml) and liter (l).
• We use measuring cups or bottles to measure capacity.
• Example: A water bottle can hold 1 liter of water.

Time

• Time tells us when things happen.
• We use units like seconds, minutes, hours, days, weeks, months, and years.
• We use clocks and calendars to measure time.
• Example: School starts at 8 o’clock in the morning.

Money

• Money is used to buy things.
• We use coins and notes of different values (₹1, ₹2, ₹5, ₹10, ₹20, ₹50, ₹100, etc.).
• We add and subtract money to find out how much we have or need.
• Example: If you buy a toy for ₹50 and give ₹100, you get ₹50 back.

Fun Activity: Measurement Hunt

Find objects at home and measure their length, weight, and capacity. Write down what you find!

Summary

• Length, weight, capacity, time, and money are important in daily life.
• We use different units and tools to measure them.
• Knowing how to measure helps us solve real-life problems.

Practice Questions

1. What unit will you use to measure the length of a table?
2. How do you measure the weight of fruits?
3. What is the capacity of a bucket?
4. How many minutes are there in an hour?
5. If you have ₹20 and buy a pen for ₹15, how much money is left?

Challenge Yourself

• Convert 2 meters into centimeters.
• Find the total weight of 3 apples if each weighs 100 grams.
• Write the time you wake up and go to bed.
• List three things you can buy with ₹50.

Did You Know?

• The longest river in India is the Ganga!
• A leap year has 366 days instead of 365.

Glossary

• Length: How long or tall something is.
• Weight: How heavy something is.
• Capacity: How much a container can hold.
• Time: When something happens.
• Money: What we use to buy things.

Answers to Practice Questions

1. Centimeter or meter.
2. Using a weighing scale.
3. Usually 10 liters (answers may vary).
4. 60 minutes.
5. ₹5 is left.

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Practice measuring and using money every day to become a smart mathematician!