X Tables
subtraction

Subtraction as difference

Compare two quantities to find how far apart they are.

Quick answer

Subtraction as difference means finding how much one number is bigger or smaller than another. You can find the difference by counting up or down, using a number line, or by subtracting the smaller number from the bigger one.

Learning outcome

By the end of this page, you will understand how to find the difference between two numbers and use this to compare quantities in real-life situations. Success signs:
  • You can explain what difference means
  • You can find the difference between two numbers using subtraction
  • You can solve problems that ask "how much more" or "how much less"
  • You can use a number line to show the difference between numbers

Why this matters

Understanding subtraction as difference helps you compare things in everyday life. Whether you're sharing snacks, comparing your height to your friend's, or checking how many more points you need to win a game, knowing how to find the difference is useful. It also helps you get ready for more advanced maths like negative numbers and word problems.

How it works

To find the difference between two numbers, you can:
  1. Use a number line to count up from the smaller number to the bigger one
  2. Subtract the smaller number from the bigger number
  3. Use objects like counters or blocks to show the difference
Let’s start with simple numbers and build up. If you have 8 apples and your friend has 5 apples, the difference is how many more apples you have. You can count up from 5 to 8, or subtract 5 from 8.

Examples you can see

Let’s imagine you and your friend are comparing your toy collections. Example 1: You have 7 toy cars. Your friend has 3 toy cars.
  • How many more toy cars do you have? (Answer: 7 – 3 = 4)
  • How many fewer toy cars does your friend have? (Answer: 7 – 3 = 4)
Example 2: You are 10 years old. Your sister is 6 years old.
  • How much older are you? (Answer: 10 – 6 = 4)
  • How much younger is your sister? (Answer: 10 – 6 = 4)
Example 3: You have 12 stickers. Your brother has 8 stickers.
  • How many more stickers do you have? (Answer: 12 – 8 = 4)
  • How many fewer stickers does your brother have? (Answer: 12 – 8 = 4)
You can also show this on a number line:
  • Start at 3 and count up to 7: 3, 4, 5, 6, 7. That’s 4 steps.
  • Start at 8 and count up to 12: 8, 9, 10, 11, 12. That’s 4 steps.

Try it as a mini adventure

Adventure: The Great Fruit Race You and your friend are in a fruit race. You collect 9 apples and your friend collects 5 apples. You want to know how much further ahead you are.
  1. First, you count the apples: You have 9, your friend has 5.
  2. Next, you find the difference: 9 – 5 = 4
  3. Then, you say: “I have 4 more apples than my friend.”
  4. Finally, you check: 5 + 4 = 9. That’s right!
You can also play this game with your family. Collect different amounts of items like coins, blocks, or toys. Then, find the difference between the amounts.

Common mistakes

  • Mistake: Thinking that 7 – 3 = 10 instead of 4.
    Why it happens: Confusing subtraction with addition.
    Fix: Use a number line or count backwards from the bigger number.
  • Mistake: Not knowing which number is bigger when comparing.
    Why it happens: Not reading the problem carefully.
    Fix: Always ask, “Which number is more?” or “Which number is less?”
  • Mistake: Forgetting to write the answer in a sentence.
    Why it happens: Rushing or not understanding what the question is asking.
    Fix: Always answer with a sentence like, “I have 4 more apples.”

Parent and carer guide

As a parent or carer, you can help by:
  • Using everyday situations to talk about difference, like comparing ages, heights, or toy collections
  • Encouraging your child to explain how they found the difference
  • Using number lines or counting blocks to help visualise the problem
  • Practising with fun examples like comparing how many stickers or toys each person has
  • Checking that your child answers in full sentences, not just numbers
If your child gets stuck, ask questions like:
  • “Which number is bigger?”
  • “How many more do you need to get to the bigger number?”
  • “Can you use your fingers or blocks to show this?”

Practice questions

  1. There are 10 birds on a tree. 6 birds fly away. How many birds are left? Answer: 4
  2. Tom has 12 marbles. Sam has 7 marbles. How many more marbles does Tom have? Answer: 5
  3. There are 15 cats in the park. 9 cats are sleeping. How many cats are awake? Answer: 6
  4. Lucy is 8 years old. Her brother is 5 years old. How much older is Lucy? Answer: 3
  5. There are 14 balloons. 6 balloons pop. How many balloons are left? Answer: 8
  6. Emma has 11 books. Her sister has 4 books. How many more books does Emma have? Answer: 7
  7. There are 13 cookies. 5 cookies are eaten. How many cookies are left? Answer: 8
  8. Ben is 10 years old. His cousin is 3 years old. How much older is Ben? Answer: 7
  9. There are 16 fish in a tank. 7 fish swim away. How many fish are left? Answer: 9
  10. There are 17 pencils. 9 pencils are broken. How many pencils are not broken? Answer: 8

FAQ

What is subtraction as difference?

Subtraction as difference means finding how much one number is bigger or smaller than another number.

How do I find the difference between two numbers?

You can find the difference by subtracting the smaller number from the bigger number. You can also use a number line to count up from the smaller number to the bigger one.

Can I use subtraction to compare things in real life?

Yes! You can use subtraction as difference to compare ages, heights, toys, food, or anything else you can count.

Why is it important to know how to find differences?

Knowing how to find differences helps you solve problems, compare things, and get ready for more advanced maths like negative numbers and word problems.

How can I practice subtraction as difference at home?

You can practice by comparing toy collections, counting items, or playing games with friends where you find how much more or less one person has.