Mathematics Class 3 - Length Weight-Qualtity-Time-And-Temperature Notes

Length, Weight, Quantity, Time and Temperature

Welcome to the chapter on Length, Weight, Quantity, Time and Temperature for Class 3. In this chapter, you will learn how to measure different things around you, understand units, and use tools like rulers, clocks, and thermometers. By the end of this chapter, you will be able to compare, measure, and talk about length, weight, quantity, time, and temperature!

Introduction

We use measurement every day. We measure how long something is, how heavy it is, how much there is, what time it is, and how hot or cold it is. Let’s learn about these important ideas!

Length

Length tells us how long or tall something is.

• We use rulers or measuring tapes to measure length.
• Common units: centimeter (cm), meter (m), kilometer (km).
• Example: The pencil is 15 cm long.

Weight

Weight tells us how heavy something is.

• We use weighing scales to measure weight.
• Common units: gram (g), kilogram (kg).
• Example: The watermelon weighs 2 kg.

Quantity

Quantity tells us how much of something there is.

• We measure liquids using measuring cups or bottles.
• Common units: milliliter (ml), liter (l).
• Example: The bottle has 1 liter of water.

Time

Time tells us when things happen and how long they take.

• We use clocks and watches to measure time.
• Common units: second (s), minute (min), hour (h).
• Example: The movie is 2 hours long.

Temperature

Temperature tells us how hot or cold something is.

• We use thermometers to measure temperature.
• Common units: degree Celsius (°C), degree Fahrenheit (°F).
• Example: Today, the temperature is 30°C.

Fun Activity: Measure and Compare!

Find three objects at home. Measure their length, weight, and quantity. Check the time and temperature outside. Write down your findings!

Summary

• Length, weight, quantity, time, and temperature help us understand the world.
• We use different tools and units to measure each one.
• Measuring helps us compare and use things correctly.

Practice Questions

1. What tool do you use to measure length?
2. Which unit is used for weight?
3. How do you measure time?
4. What is used to measure temperature?
5. How many milliliters are there in one liter?

Challenge Yourself

• Measure the length of your desk and the weight of your school bag.
• Find the temperature outside and write it down.

Did You Know?

• Water freezes at 0°C and boils at 100°C!
• There are 1,000 milliliters in one liter.

Glossary

• Length: How long or tall something is.
• Weight: How heavy something is.
• Quantity: How much there is.
• Time: When or how long something happens.
• Temperature: How hot or cold something is.

Answers to Practice Questions

1. Ruler or measuring tape.
2. Gram (g) or kilogram (kg).
3. With a clock or watch.
4. Thermometer.
5. 1,000 milliliters.

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Measuring is fun! Try to measure things around you and learn more every day.