Scratch grid battleships maths mission

Quick answer

You can use a grid battleships game in Scratch to practice coordinates, which are pairs of numbers that show where something is on a grid. By playing this game, you'll learn how to read and write coordinates like (3, 5) and use them to find and guess positions on a grid.

Learning outcome

By the end of this page, you will be able to use a grid to find and describe positions using coordinates, like (2, 4) or (7, 1), and play a fun game to practice these skills.

• You can read and write coordinates correctly.
• You can use coordinates to find a position on a grid.
• You can play a battleships-style game using coordinates.
• You can explain how coordinates help us find things in real life.

Why this matters

Coordinates are used everywhere! When you play games like battleships, look at a map, or even find your seat in a cinema, you are using coordinates. In Scratch, you'll learn how to make a computer understand where to place things on a grid. This helps you understand how to find your way around in the real world and how to make your own games!

How it works

Coordinates are two numbers that show where something is on a grid. The first number tells you how far across (left or right) and the second number tells you how far up or down. For example, (3, 4) means 3 spaces to the right and 4 spaces up. The grid starts at (0, 0) in the bottom left corner.

1. Look at the grid with rows and columns.
2. Find the number on the bottom (horizontal) line for your position.
3. Find the number on the side (vertical) line for your position.
4. Write the two numbers as a pair in brackets, like (row, column).

Examples you can see

Imagine you have a grid like a football pitch or a chessboard. Each square has a position.

Let’s say you want to find the square that is 2 spaces across and 3 spaces up. That would be position (2, 3), which is square M.

Another example: If you're looking for square (4, 1), that’s 4 spaces across and 1 space up. That’s square D.

Try it as a mini adventure

Imagine you're on a treasure hunt! You have a map with a grid and a secret message. The message says, "Find the treasure at position (5, 2) on the grid." You start at the bottom left and move your finger to the right 5 times, then up 2 times. You found the treasure! Now, you need to write down the coordinates of your next clue. If it's at position (3, 4), you write it as (3, 4).

Let’s play a game:

1. Draw a 5 by 5 grid on paper.
2. Put a star at position (2, 3).
3. Ask a friend to guess where it is using coordinates.
4. Give them clues like “It’s in the second row and third column.”
5. Write down the coordinates they guess.
6. Keep playing until you both find all the secret spots!

Common mistakes

• Mistake: Writing coordinates in the wrong order, like (4, 2) instead of (2, 4).
  Why it happens: Confusing which number means how far across and which means how far up.
  Fix: Remember: first number = across, second number = up.
• Mistake: Forgetting that the grid starts at (0, 0) in the bottom left.
  Why it happens: Not knowing where the grid begins.
  Fix: Always start counting from the bottom left corner.
• Mistake: Adding or subtracting the wrong numbers when moving on the grid.
  Why it happens: Not counting carefully or getting confused with directions.
  Fix: Count slowly and check your work with a friend or parent.

Parent and carer guide

Help your child practice coordinates with a simple game. Draw a 5 by 5 grid on paper and place small objects like coins or toys at different positions. Ask your child to find them using coordinates. You can also use a real map or a floor grid to practice.

What to say:

• “Let’s think about how to get to the treasure!”
• “Which number tells us how far across?”
• “Can you find (3, 2) on the grid?”

What not to worry about:

• It’s normal for children to get confused at first. Practice makes progress!
• Don’t rush. Take time to talk through each step.
• Let your child make mistakes and correct them together.

Practice questions

1. What are the coordinates for the square that is 1 space across and 4 spaces up?
   Answer: (1, 4)
2. Find the square at position (3, 2).
   Answer: 3 spaces across and 2 spaces up
3. Write the coordinates for a square that is 5 spaces across and 1 space up.
   Answer: (5, 1)
4. Which position is (2, 3)?
   Answer: 2 spaces across and 3 spaces up
5. What are the coordinates for the square at 4 spaces across and 5 spaces up?
   Answer: (4, 5)

FAQ

What are coordinates?

Coordinates are two numbers that tell you where something is on a grid. The first number is how far across, and the second number is how far up.

How do I remember which number is which?

Think of it like this: "Across first, then up." You can also remember it with a rhyme: "X is across, Y is up."

Can I use coordinates in real life?

Yes! You use coordinates when you read a map, find your seat in a cinema, or play games like battleships.

Why do we start at (0, 0) in the bottom left?

This is a common way to start grids in math and games. It helps everyone understand where things are in the same way.

How can I practice more?

You can draw grids and place items at different coordinates, or play games like battleships online or in books. Try making your own Scratch project too!