Maths Adventures
Space explorer maths quest: subtraction
A story-led junior maths adventure using rockets, planets and alien signals to work out what is left after trades, rescues or escapes.
Quick answer
Subtraction is about finding what is left when you take away some items. In a space explorer maths quest, you might start with 10 rocket fuel tanks and use 3 of them, leaving 7 tanks. Subtraction helps you work out how many are left.Learning outcome
By the end of this page, you will be able to subtract numbers up to 20 to solve space explorer problems like: How many aliens are left after some escape? How many fuel tanks are left after a mission? You will understand that subtraction means taking away and finding the difference. Success signs:- You can count backwards to solve subtraction problems
- You can use objects or drawings to show subtraction
- You can solve real-life space subtraction problems
- You can explain how subtraction helps in space missions
Why this matters
Subtraction is super important for space explorers! When astronauts go on missions, they need to know how much fuel is left, how many supplies are remaining, or how many aliens they have rescued. If you are a space explorer, you must be good at subtraction to stay safe and solve problems. In games, subtraction helps you track points, lives, or resources. In everyday life, you use subtraction when you eat 3 cookies from a pack of 10, or when you have 12 minutes left to finish your homework.How it works
Subtraction is like taking something away. If you have 8 stars and you take away 3 stars, you have 5 stars left. This is written as: 8 - 3 = 5. The minus sign (-) shows you are taking something away. To subtract:- Start with the bigger number (the total)
- Count backwards the number you are taking away
- Find the number you land on
Examples you can see
Let's imagine you are on a space mission to Planet Zog. You have 12 alien signal devices, but 5 are broken. How many working devices do you have left? We start with 12 devices. We take away 5 broken ones. 12 - 5 = 7 So, you have 7 working alien signal devices. Another example: You are in a spaceship with 9 fuel tanks. You use 4 tanks to get to Mars. How many tanks do you have left? 9 - 4 = 5 You have 5 fuel tanks left. You can also use a number line to solve subtraction: If you start at 10 and jump back 3 steps, you land on 7. 10 - 3 = 7Try it as a mini adventure
Space Explorer Mission: The Rescue You are on a space mission to save 15 aliens from a space station. You have a rocket with 5 pods. Each pod can carry 3 aliens. How many aliens can you rescue in total? First, count how many aliens the rocket can carry: 5 pods × 3 aliens = 15 aliens All aliens can be rescued. But wait! 2 aliens are already rescued. How many are left to save? 15 - 2 = 13 So, you still need to rescue 13 aliens. Then, you save 6 more aliens. How many are left to rescue now? 13 - 6 = 7 You still have 7 aliens to rescue. Finally, you rescue the last 7 aliens. How many are left? 7 - 7 = 0 You rescued all aliens! Mission complete!Common mistakes
- Mistake: Thinking that 8 - 3 = 11
Why it happens: Confusing subtraction with addition.
Fix: Remember that subtraction means taking away. Count backwards from 8: 7, 6, 5. So 8 - 3 = 5. - Mistake: Starting from the smaller number when subtracting
Why it happens: Not understanding that you start with the bigger number.
Fix: Always start with the bigger number and count backwards. - Mistake: Using fingers to count forward instead of backwards
Why it happens: Not knowing that subtraction is about taking away.
Fix: Practice counting backwards from bigger numbers to get used to subtraction. - Mistake: Not writing the minus sign
Why it happens: Forgetting the symbol or writing it incorrectly.
Fix: Always use the minus sign (-) to show subtraction.
Parent and carer guide
To help your child with subtraction in space adventures:- Use real objects like toys or food to show subtraction
- Play subtraction games with dice or cards
- Ask questions like "If you had 10 space rocks and gave 3 to your friend, how many would you have?"
- Encourage drawing pictures to solve problems
- Practice counting backwards from 10 to 5
- Remember that it's okay to make mistakes – they help you learn!
Practice questions
- There are 10 alien spaceships. 4 are destroyed. How many are left?
Answer: 10 - 4 = 6 - You have 15 rocket fuel tanks. You use 7. How many are left?
Answer: 15 - 7 = 8 - There are 12 stars in your telescope. 5 disappear. How many are left?
Answer: 12 - 5 = 7 - You start with 9 space snacks. You eat 3. How many are left?
Answer: 9 - 3 = 6 - There are 14 planets. 6 are explored. How many are left?
Answer: 14 - 6 = 8
FAQ
What is subtraction? Subtraction is when you take something away from a group. For example, if you have 10 apples and eat 3, you have 7 apples left. We write this as 10 - 3 = 7.
Why do we use subtraction? We use subtraction to find out how many are left after something is taken away. It helps us plan, solve problems, and keep track of things in space missions, games, and daily life.
How can I practice subtraction? You can practice by using objects like toys or counters, drawing pictures, or counting backwards. Try solving space-themed problems like: "You have 12 planets to visit and visit 5. How many are left?"
What is the minus sign? The minus sign (-) is a symbol that shows subtraction. It means "take away" or "subtract". For example, 10 - 4 = 6 means 10 take away 4 equals 6.
Can subtraction be done with big numbers? Yes! Subtraction works with any numbers. You can subtract 20 from 30, or 100 from 150. The process is the same, but it might take more steps.