Balance scales

Quick answer

Balance scales help you compare the mass of objects and understand that two things can be equal in weight. You can use them to learn about equations, equal groups, and how to make both sides of a scale match.

Learning outcome

By the end of this page, you will understand how to use balance scales to compare weights and solve simple problems involving equality and balance.

• You can place objects on a balance scale and see which side is heavier or if they are equal.
• You can use the scale to solve simple problems about weight and balance.
• You can think about how equal groups work using the scale.
• You can understand that if both sides are balanced, the weights are equal.

Why this matters

Balance scales are a great way to learn about mass, equality, and basic equations. They help you understand that things can be equal in weight, and that you can use this idea to solve problems. You’ll use these skills in everyday life when you share food, compare prices, or even play games.

Balance scales also help with more advanced maths like algebra later on, where you’ll learn about equations and how to keep both sides equal. So, learning with scales now helps you build a strong maths foundation!

How it works

Balance scales work like a seesaw. You put objects on each side, and if one side goes down, it means that side is heavier. If both sides go up and down equally, they are balanced, which means they weigh the same.

Here's how to use a balance scale:

1. Place one object on the left side of the scale.
2. Place another object on the right side of the scale.
3. Look at which side goes down. That side is heavier.
4. If both sides stay level, they weigh the same.

You can also use the scale to find out how much something weighs by using known weights, like coins or blocks, to balance it.

Examples you can see

Let’s imagine you are playing with your balance scale at home. Here are some examples:

Example 1: Comparing two objects

You put a toy car on the left side and a toy train on the right side. The car side goes down. That means the car is heavier than the train.

Example 2: Equal weights

You put 3 apples on the left side and 3 apples on the right side. Both sides stay level. That means the apples weigh the same.

Example 3: Using known weights

You have a 100g weight and a mystery object. You put the 100g weight on the left and the mystery object on the right. If they balance, the mystery object weighs 100g.

Example 4: Making a balance

You have 4 marbles on the left side. How many marbles do you need on the right side to make it balance? You need 4 marbles on the right side.

Try it as a mini adventure

Adventure: The Great Scale Challenge

You are a detective trying to solve a mystery. You find a treasure chest, but it’s locked. The key is hidden in a box, and the box only opens if you balance it perfectly. You have a balance scale and some objects.

Here’s your challenge:

1. Place a 150g book on the left side of the scale.
2. Put 3 identical toy blocks on the right side.
3. How much does each toy block weigh if the scale balances?

Answer: Each block weighs 50g. (150g ÷ 3 = 50g)

Try this with your own objects at home. Use coins, books, or toys to make your own balance challenge!

Common mistakes

• Mistake: Thinking that a heavier object always makes the scale tip down on the side where it is placed. Why it happens: It's easy to confuse the direction of the scale with the weight. Fix: Remember that the side that goes down is the heavier side, no matter which side you put it on.
• Mistake: Not understanding that the scale balances when both sides are equal. Why it happens: Young children may think that one side must always be heavier. Fix: Practice with equal weights and explain that a balanced scale means both sides are equal.
• Mistake: Using the scale incorrectly by placing too many objects on one side. Why it happens: Children might not understand how to distribute weight evenly. Fix: Start with small numbers and simple comparisons. Gradually add more objects.

Parent and carer guide

As a parent or carer, you can help your child understand balance scales by:

1. Letting your child play with a real balance scale or a toy one.
2. Asking questions like, “Which side is heavier?” or “What happens if we add more?”
3. Using everyday objects like fruits, coins, or toys to test balance.
4. Encouraging your child to guess what will happen before they place the objects.
5. Practicing simple problems together, like “If one side has 5 marbles, how many marbles do we need on the other side to balance?”

Don’t worry if your child gets confused at first. Balance scales are a new concept, and it takes time to understand how they work. Be patient, and make it fun!

Practice questions

1. If you put 4 apples on the left side and 4 apples on the right side, will the scale balance? Why or why not?
2. You have a 120g weight and a mystery object. If the scale balances, how much does the mystery object weigh?
3. One side of the scale has 3 toy cars. How many toy cars should be on the other side to make it balance?
4. You put 2 books on the left side and 3 books on the right side. Which side goes down?
5. You have 6 marbles on one side. How many marbles do you need on the other side to make it balance?

Answers:

1. Yes, because both sides have the same number of apples.
2. The mystery object weighs 120g.
3. 3 toy cars.
4. The right side goes down because 3 books are heavier than 2 books.
5. 6 marbles.

FAQ

What is a balance scale used for?

A balance scale is used to compare the mass of objects and see if they are equal or if one is heavier than the other.

Can balance scales be used to measure exact weights?

Yes, balance scales can be used to measure exact weights if you use known weights and match them with unknown objects.

How do you know if the scale is balanced?

The scale is balanced when both sides are level, meaning they weigh the same.

Can I use balance scales with young children?

Yes! Balance scales are great for children of all ages. They help teach concepts like equality, comparison, and basic problem-solving.

What are some real-life uses of balance scales?

Balance scales are used in cooking, shopping, science experiments, and even in games and puzzles. They help us understand weight and balance in everyday life.