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Maths Without Realising

Maths detective: reading house numbers

A mini detective challenge where children spot place value and patterns while reading house numbers.

Quick answer

House numbers help us understand place value and patterns in numbers, which is a key maths skill.

Learning outcome

By the end of this page, you will be able to spot and explain the patterns in house numbers on your street, and understand how the digits in a number show different values. Success signs:
  • You can explain what each digit in a house number means (tens and ones)
  • You can find the pattern in a set of house numbers
  • You can predict what the next house number might be
  • You can use house numbers to solve simple problems

Why this matters

House numbers are all around us, and they're like little maths puzzles waiting to be solved. When you read house numbers, you're actually using your knowledge of place value and patterns. This helps you understand how numbers work, which is useful for counting, adding, subtracting, and even learning times tables. The skills you learn from reading house numbers help you with everything from reading a clock to understanding your pocket money.

How it works

Let's start with a simple idea: house numbers are made of digits, just like the numbers you count with. Each digit in a house number has a different value depending on where it is. In a two-digit number like 15, the "1" is in the tens place and the "5" is in the ones place. The "1" means one group of ten, and the "5" means five groups of one. When you see house numbers, you can look for patterns. For example, if you walk down a street and see numbers like 10, 12, 14, 16, you can see that they go up by two each time. This is a pattern, and it's a helpful way to understand how numbers work.

Examples you can see

Let's look at some house numbers and what they tell us. Example 1: House numbers 23, 24, 25 If you see house numbers like 23, 24, 25, you can see that:
  • The first digit (2) stays the same
  • The second digit (3, 4, 5) goes up by one each time
  • This shows that the tens place doesn't change, but the ones place increases
Example 2: House numbers 30, 40, 50 If you see numbers like 30, 40, 50, you can see that:
  • The second digit (0) stays the same
  • The first digit (3, 4, 5) goes up by one each time
  • This shows that the tens place increases while the ones place stays at zero
Example 3: House numbers 101, 102, 103 If you see numbers like 101, 102, 103, you can see that:
  • The first two digits (1, 0) stay the same
  • The last digit (1, 2, 3) goes up by one
  • This shows that we're counting up by ones, but the first part of the number stays the same

Try it as a mini adventure

Mini Adventure: The House Number Detective You are a detective on a mission to find the pattern in house numbers on your street. Here's your challenge: 1st time: Look at the house numbers from 1 to 10 on your street 2nd time: Look at the house numbers from 11 to 20 3rd time: Look at the house numbers from 21 to 30 4th time: What pattern do you notice? What comes next? 5th time: Try to find the house number that comes after 47 What to do:
  • Walk down your street and look at the house numbers
  • Write them down in order
  • Look for patterns in the tens and ones places
  • Try to predict what the next number might be
What you're learning: As you look at these numbers, you're using your brain to notice how numbers grow and change. This helps you understand how the place value system works, which is the foundation for all number work.

Common mistakes

  • Mistake: Thinking that 10 is bigger than 2
    Why it happens: Children sometimes confuse the number of digits with the size of the number.
    Fix: Use counting blocks or draw groups of objects to show that 10 is actually ten objects, which is more than two objects.
  • Mistake: Not seeing that the tens digit changes when counting by tens
    Why it happens: Young children often focus only on the last digit and miss the bigger pattern.
    Fix: Use visual aids like base ten blocks or draw groups of ten to help see how the tens place changes.
  • Mistake: Thinking that 100 comes right after 99
    Why it happens: The pattern of counting can be confusing when moving from two-digit to three-digit numbers.
    Fix: Practice counting with objects or use a number line to show how 99 becomes 100 when you add one more.

Parent and carer guide

As a parent or carer, you can help your child by:
  • Walking around your street and looking at house numbers together
  • Asking questions like "What do you notice about these numbers?" or "What comes next?"
  • Using everyday situations to talk about numbers, like when you're shopping or cooking
  • Encouraging your child to count and predict numbers in different contexts
  • Noticing when your child shows an interest in patterns and numbers, and building on that
What to say:
  • "Let's look at these house numbers and see what we notice"
  • "What do you think comes next in this pattern?"
  • "How many tens are in this number?"
  • "Can you show me how many ones are in this number?"
What not to worry about:
  • Your child might not get it straight away - that's normal
  • Some children learn patterns faster than others
  • It's okay if they make mistakes - they're learning!

Practice questions

  1. What is the next house number after 34?
    Answer: 35
  2. What is the next house number after 59?
    Answer: 60
  3. What is the next house number after 100?
    Answer: 101
  4. What is the next house number after 78?
    Answer: 79
  5. What is the next house number after 99?
    Answer: 100
  6. What is the next house number after 23?
    Answer: 24
  7. What is the next house number after 45?
    Answer: 46
  8. What is the next house number after 67?
    Answer: 68
  9. What is the next house number after 89?
    Answer: 90
  10. What is the next house number after 111?
    Answer: 112

FAQ

What do the digits in a house number mean?

Each digit in a house number has a place value. In a two-digit number like 25, the "2" is in the tens place and means two groups of ten, and the "5" is in the ones place and means five groups of one.

Why do house numbers go up in patterns?

House numbers follow a pattern so people can find houses easily. They usually go up by one, or by two, or by ten, which makes it easier to count and find the right house.

How can I help my child learn from house numbers?

You can walk around your street and look at house numbers together. Ask your child to find patterns, predict what comes next, and explain what each digit means. You can also use house numbers to practice counting and addition.

Are house numbers the same everywhere?

Not exactly. In some places, house numbers go up by one. In others, they might go up by two or follow a different pattern. But the idea of place value and patterns is the same everywhere.

Can I use house numbers for other maths learning?

Yes! You can use house numbers to practice addition, subtraction, multiplication, and even division. You can also use them to learn about even and odd numbers, or to explore bigger numbers like hundreds and thousands.