X Tables
addition

Adding one and two

Build early fluency without relying only on memorised sequences.

Quick answer

Adding one and two means counting on from a number by one or two steps. You can do this with your fingers, objects, or by thinking about numbers.

Learning outcome

By the end of this page, you will be able to add one and two to any number up to 20, using counting, objects, or number lines. Success signs:
  • You can count on from any number when adding one or two
  • You can use objects like blocks or toys to show adding one or two
  • You can solve simple addition problems like 5 + 1 = ? or 7 + 2 = ?
  • You can explain how you added one or two to a number

Why this matters

Adding one and two helps you build a strong foundation in maths. It's the first step to learning bigger addition sums. You use this skill every day when you count your toys, share snacks, or play games. It's also a key part of learning times tables later.

How it works

When you add one or two to a number:
  1. Start with your first number
  2. Count on one or two more steps
  3. Find the final number
You can do this with:
  • Your fingers
  • Objects like blocks or toys
  • A number line
  • Thinking in your head

Examples you can see

Let's look at adding one and two with simple examples:

Adding one

  • 3 + 1 = 4
  • 7 + 1 = 8
  • 10 + 1 = 11

Adding two

  • 5 + 2 = 7
  • 9 + 2 = 11
  • 12 + 2 = 14

Using objects

If you have 6 toy cars and get 1 more, you can count them all:
  • 6 cars
  • Count on 1 more: 7
  • So 6 + 1 = 7
If you have 8 apples and get 2 more:
  • 8 apples
  • Count on 2 more: 9, 10
  • So 8 + 2 = 10

Using a number line

To solve 4 + 2:
  • Start at 4
  • Move 2 steps forward
  • You land on 6
  • So 4 + 2 = 6

Real-world example: Sharing cookies

Imagine you have 5 cookies. Your friend gives you 2 more cookies.
  • Start with 5 cookies
  • Add 2 more
  • Count them all: 5, 6, 7
  • You now have 7 cookies

Real-world example: Jumping game

You're playing a jumping game. You start at number 8. You jump forward 2 steps.
  • Start at 8
  • Jump 1 step to 9
  • Jump 2 steps to 10
  • You land on 10

Try it as a mini adventure

Adventure: The Magic Number Garden You are a gardener in a magical garden. Every day you plant flowers. Today you have 5 flowers. The magic garden gives you 2 more flowers.
  • First, count your 5 flowers
  • Then, add 2 more flowers
  • How many flowers do you have now?
Let's do this together:
  • You start with 5 flowers
  • Count on 2 more: 6, 7
  • You now have 7 flowers
Now try this challenge:
  • Start with 3 flowers
  • Get 1 more flower
  • How many flowers do you have?

Another challenge

  • You have 9 toy cars
  • You find 2 more cars
  • Count them all

Step-by-step:

  • Start with 9 cars
  • Count on 2 more: 10, 11
  • You now have 11 cars

Common mistakes

  • Mistake: Thinking 6 + 2 = 8, but counting wrong
    Why it happens: When counting on, children might skip numbers or count backwards
    Fix: Use fingers or objects to check your counting
  • Mistake: Adding 1 and 2 to the wrong number
    Why it happens: Not understanding what "adding one" means
    Fix: Practice with number lines or counting objects
  • Mistake: Forgetting to start with the first number
    Why it happens: Rushing or not listening carefully
    Fix: Always say the first number out loud before adding

Parent and carer guide

How to help your child at home:
  • Use everyday situations like sharing snacks or counting toys
  • Practice counting on with fingers or objects
  • Ask your child to explain how they solved a problem
  • Make it fun with games or stories
  • Don't worry if they make mistakes - they're learning!
What to say:
  • "Let's count together!"
  • "How did you figure that out?"
  • "Can you show me with your fingers?"
  • "Great job counting on!"
What not to do:
  • Don't make it feel like a test
  • Don't rush your child
  • Don't say "that's wrong" - say "let's try again"

Practice questions

  1. What is 4 + 1?
  2. What is 6 + 2?
  3. What is 9 + 1?
  4. What is 3 + 2?
  5. What is 11 + 1?
  6. What is 5 + 2?
  7. What is 7 + 1?
  8. What is 10 + 2?
  9. What is 2 + 1?
  10. What is 8 + 2?

Answers:

  1. 5
  2. 8
  3. 10
  4. 5
  5. 12
  6. 7
  7. 8
  8. 12
  9. 3
  10. 10

FAQ

What does it mean to add one and two?

Adding one and two means counting on from a number by one or two steps. It's like moving forward on a number line.

Why do we learn to add one and two?

Adding one and two helps build your number sense. It's the foundation for bigger addition problems and makes mental maths easier.

How can I practice adding one and two?

You can practice by counting objects, using your fingers, playing games, or solving simple problems like 5 + 1 or 3 + 2.

Can I add one and two to any number?

Yes! You can add one and two to any number up to 20. The bigger the number, the more steps you count on.

What if I get confused when counting?

That's okay! Use your fingers, count on objects, or draw pictures. These help you keep track of your counting.