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Real World Maths Adventures

The robot factory arrays question prompts

Adult prompts and extension questions for build robots from equal groups of wheels, arms, buttons and batteries.

Quick answer

You can use equal groups and arrays to work out how many robot parts you need to build robots in a factory. By counting the parts in each group and multiplying by the number of groups, you can quickly find the total number of parts needed.

Learning outcome

By the end of this page, you will be able to use arrays and equal groups to solve real-world problems about how many parts are needed to build robots in a factory. Success signs:
  • You can make an array with objects to show equal groups
  • You can count how many parts are in each group and how many groups there are
  • You can multiply to find the total number of parts needed
  • You can solve a robot factory problem using your own array

Why this matters

Arrays and equal groups are used in real life all the time! In a robot factory, workers need to know how many wheels, arms, buttons, or batteries they need to make each robot. This helps them buy the right amount of materials, plan their work, and keep the factory running smoothly. Whether you're helping in a factory or just sharing snacks with friends, knowing how to count equal groups is super helpful.

How it works

To solve robot factory problems, follow these steps:
  1. Think about how many parts are in each group (like how many wheels on each robot)
  2. Count how many groups you have (like how many robots you are making)
  3. Use multiplication or repeated addition to find the total number of parts
  4. Draw or build an array to show your work

Examples you can see

Let's imagine you're working in a robot factory. You are making robots that each have:
  • 4 wheels
  • 2 arms
  • 3 buttons
  • 1 battery
If you are making 5 robots, how many wheels do you need? Method 1: Repeated addition 4 + 4 + 4 + 4 + 4 = 20 wheels Method 2: Arrays You can make an array with 5 rows and 4 columns to show 5 robots with 4 wheels each.
Robot 1 Robot 2 Robot 3 Robot 4 Robot 5
W W W W W
W W W W W
W W W W W
W W W W W
There are 20 wheels in total.

Try it as a mini adventure

The Robot Factory Challenge You are the new worker at a robot factory. You need to make 6 robots for the big order. Each robot needs:
  • 4 wheels
  • 2 arms
  • 3 buttons
  • 1 battery
Your adventure:
  1. Draw an array for each part showing how many robots you are making
  2. Count how many parts you need for each type
  3. Write a multiplication sentence for each part
  4. How many parts in total do you need?
4th time: How many wheels do you need? You need 6 robots with 4 wheels each. 6 × 4 = 24 wheels 5th time: How many arms do you need? You need 6 robots with 2 arms each. 6 × 2 = 12 arms 6th time: How many buttons do you need? You need 6 robots with 3 buttons each. 6 × 3 = 18 buttons 7th time: How many batteries do you need? You need 6 robots with 1 battery each. 6 × 1 = 6 batteries 8th time: Total parts needed? Add all parts together: 24 + 12 + 18 + 6 = 60 parts

Common mistakes

  • Mistake: Counting the rows and columns wrong in an array.
    Why it happens: Mixing up the number of groups with the number of items in each group.
    Fix: Label each row and column clearly. Count them one by one to check.
  • Mistake: Forgetting to multiply, just adding the numbers.
    Why it happens: Not understanding that repeated addition is the same as multiplication.
    Fix: Use arrays to show the groups. Then multiply to get the total.
  • Mistake: Thinking 6 × 0 = 6 instead of 0.
    Why it happens: Confusing multiplication with addition.
    Fix: Remember that zero groups means zero parts, no matter how many parts are in each group.

Parent and carer guide

You can help your child by:
  • Using real objects like buttons, blocks, or toys to make arrays
  • Asking questions like, "How many rows do you have?" or "How many items are in each row?"
  • Letting them draw arrays to show their thinking
  • Encouraging them to check their answers by adding up the groups
  • Practicing with everyday examples like sharing snacks or setting the table

Practice questions

  1. How many wheels do you need for 8 robots if each robot has 4 wheels?
    Answer: 8 × 4 = 32 wheels
  2. How many buttons do you need for 5 robots if each robot has 3 buttons?
    Answer: 5 × 3 = 15 buttons
  3. How many arms do you need for 10 robots if each robot has 2 arms?
    Answer: 10 × 2 = 20 arms
  4. How many batteries do you need for 3 robots if each robot has 1 battery?
    Answer: 3 × 1 = 3 batteries
  5. How many wheels do you need for 12 robots if each robot has 4 wheels?
    Answer: 12 × 4 = 48 wheels

FAQ

What is an array in maths?

An array is a way to show equal groups in rows and columns. It helps you see how many items you have in total by multiplying the number of rows by the number of columns.

How can I use arrays in real life?

You can use arrays when you are setting the table (like 4 plates with 3 forks each), sharing snacks (like 5 friends with 2 cookies each), or planning how many parts you need for a project (like 6 robots with 4 wheels each).

Why do we use multiplication instead of adding?

Multiplication is faster than adding the same number over and over. For example, 5 × 4 is easier than 4 + 4 + 4 + 4 + 4.

How do I know if I have the right number of parts?

Count the number of groups, count the number of parts in each group, then multiply. You can also add up all the parts to double-check.

Can I use arrays with any number?

Yes! Arrays work with any number. You can make arrays with 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, or 12 items in each group.