X Tables
Maths Adventures

Robot maths quest: money

A story-led junior maths adventure using circuits, commands and machine logic to budget coins, tickets and shop items.

Quick answer

By the end of this adventure, you'll be able to count and add up coins and notes to buy things, just like a robot shopkeeper!

Learning outcome

By the end of this page, you will be able to:
  • Count different coins and notes to find the total value
  • Add up money amounts to check if you have enough to buy something
  • Work out how much change you should get from a shop
  • Use money to solve simple problems like budgeting for a robot's shopping list

Why this matters

Money maths is like having a superpower! When you know how to count money, you can:
  • Buy your favourite toys or snacks
  • Help your parent with shopping
  • Save up for bigger things
  • Be a smart shopper who knows if prices are fair
  • Understand how robots in the future might make decisions about what to buy
Even robots need to know maths to shop! In a robot shop, they use circuits and commands to add up prices, check if they have enough money, and work out change. You can do the same with your coins and notes.

How it works

Counting money is like counting groups of the same thing. Each coin or note has a value, and you add them all up. Here's how to do it step by step:
  1. Look at each coin or note and say its value
  2. Put them in groups (like 1p coins, 2p coins, 5p coins, etc.)
  3. Add up each group
  4. Add all the groups together to get the total

Examples you can see

Let's imagine you're helping a robot shopkeeper in a space shop. Here's how you might count the money: Example 1: Robot's Pocket Money The robot has these coins:
  • 2 x 10p coins
  • 3 x 5p coins
  • 4 x 2p coins
  • 5 x 1p coins
First, count each group:
  • 2 x 10p = 20p
  • 3 x 5p = 15p
  • 4 x 2p = 8p
  • 5 x 1p = 5p
Then add them all together: 20p + 15p + 8p + 5p = 48p So the robot has 48p in total. Example 2: Shopping at the Space Shop The robot wants to buy a laser pen that costs 35p. It has 20p, 10p, and 5p coins. Can it buy the pen? Add up what the robot has: 20p + 10p + 5p = 35p Yes! The robot has exactly enough money. Example 3: Getting Change If the robot buys a 25p battery with 50p, how much change should it get? 50p - 25p = 25p The robot should get 25p change.

Try it as a mini adventure

Robot's Shopping Mission You are a space robot helping your robot friend shop for supplies. Your mission is to make sure you have enough money for all the items on the list. Here's your shopping list:
  • 2 energy crystals at 15p each
  • 1 battery pack at 20p
  • 3 glow sticks at 5p each
  • 1 repair kit at 40p
Step 1: Count how much each group costs
  • 2 x 15p = 30p
  • 1 x 20p = 20p
  • 3 x 5p = 15p
  • 1 x 40p = 40p
Step 2: Add all the costs together 30p + 20p + 15p + 40p = 105p Step 3: Check if you have enough money You have 100p in your robot wallet. Do you have enough? 105p > 100p Step 4: Find out how much more you need 105p - 100p = 5p You need 5 more pence to buy everything!

Common mistakes

  • Mistake: Mixing up pence and pounds Why it happens: Confusing 100p = £1 with 10p = 10p Fix: Remember that 100 pence make 1 pound, so 10p is still 10p, not 1p
  • Mistake: Forgetting to add up all the coins Why it happens: Getting excited and skipping steps Fix: Count each group carefully, then add them all up one by one
  • Mistake: Thinking 2 x 5p = 10p Why it happens: Confusing multiplication with addition Fix: Remember 2 x 5p = 10p, which is the same as 5p + 5p = 10p
  • Mistake: Not checking if you have enough money Why it happens: Not reading the question carefully Fix: Always check if your total is bigger than or equal to the price
  • Mistake: Adding up the wrong coins Why it happens: Not matching the right coin to the right value Fix: Look at each coin carefully and say its value before counting

Parent and carer guide

How to help your child with robot money maths In just 5-10 minutes, you can:
  1. Play a shopping game with your child using real coins
  2. Ask them to count how much money they have
  3. Challenge them to buy something with a certain amount
  4. Practice adding up prices together
  5. Give them a budget and see if they can buy everything they want
What to say:
  • "Let's count your coins together"
  • "Can you check if you have enough money?"
  • "What happens if you spend 10p from your 25p?"
  • "How much change should you get?"
What not to worry about:
  • Your child might make mistakes - that's normal and helpful
  • They might not know all the coin values yet
  • They might need to count again - that's how learning works
Fun ideas:
  • Set up a pretend shop with toys or food
  • Use play money to practice buying items
  • Count coins during car rides
  • Ask them to save up for something special

Practice questions

  1. How much money is 3 x 10p coins?
  2. You have 20p, 10p, and 5p coins. How much do you have altogether?
  3. A robot wants to buy a 30p battery with 50p. How much change should it get?
  4. You have 4 x 5p coins and 2 x 10p coins. How much money do you have?
  5. If a robot has 75p and wants to buy something that costs 60p, how much money will it have left?
Answers:
  1. 30p
  2. 35p
  3. 20p
  4. 30p
  5. 15p

FAQ

What coins do I need to know for robot money maths?

You need to know the values of 1p, 2p, 5p, 10p, 20p, and 50p coins, plus £1 and £2 notes.

How do I add up money quickly?

Group coins by value, add each group, then add all groups together. You can also count on your fingers or use a number line.

What if I don't have enough money for something?

You need to either save more money or choose something cheaper. You can also ask a grown-up for help.

Why do robots need to know money maths?

Robots need to make smart decisions about what to buy, how much they have, and how much change they should get. It's like having a brain that thinks like a human!

Can I practice money maths with my robot toys?

Yes! Set up a robot shop with your toys, use coins to pay, and practice buying things. It's like a fun game with real maths!