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Hidden Multiplication

Multiplication hiding in screen-time blocks

Small time blocks add up across days.

Quick answer

Multiplication hides in screen-time blocks because small amounts of time add up to make longer periods. When you watch 10 minutes of a show, then 10 more minutes, and then 10 more, you've watched 30 minutes – that's 3 groups of 10, or 3 × 10 = 30.

Learning outcome

By the end of this page, you will understand how multiplication helps you count time when it’s split into small chunks, like the time you spend on screens each day. Success signs:
  • You can show how 3 groups of 10 minutes add up to 30 minutes
  • You can use repeated addition to solve time problems
  • You can solve a multiplication problem using arrays or groups
  • You can explain how screen time can be counted with multiplication

Why this matters

Multiplication helps you understand how time works when it's broken into small parts. This is useful for planning your day, knowing how long a video game will take, or tracking how much screen time you have. Whether you're watching a show, playing a game, or scrolling through your phone, multiplication helps you count the minutes and hours that add up to your screen time.

How it works

Multiplication is like counting groups of the same size. When you watch 5 minutes of a show, then 5 more minutes, and then 5 more, you're counting 3 groups of 5. This is the same as 3 × 5 = 15 minutes. To understand this:
  1. Think of a small amount of time, like 5 minutes
  2. Count how many times you do that small amount
  3. Add them all together using repeated addition or multiplication

Examples you can see

Let’s look at how screen time can be counted using multiplication: Example 1: You watch 3 short videos, each lasting 10 minutes.
  • 10 + 10 + 10 = 30 minutes
  • This is the same as 3 × 10 = 30 minutes
Example 2: You play 4 games, each taking 15 minutes.
  • 15 + 15 + 15 + 15 = 60 minutes
  • This is the same as 4 × 15 = 60 minutes
Example 3: You watch 6 episodes, each 20 minutes long.
  • 20 + 20 + 20 + 20 + 20 + 20 = 120 minutes
  • This is the same as 6 × 20 = 120 minutes
You can also use arrays to show this:
  • For 3 × 10, draw 3 rows with 10 dots in each row
  • Count all the dots to get 30

Try it as a mini adventure

Adventure: Screen Time Tracker You are a time detective! Your job is to find out how much time you spend on screens each day. Here’s how to do it: Step 1: Write down how many screen sessions you have each day (like 3 videos or 2 games). Step 2: Write down how long each session is (like 10 minutes or 15 minutes). Step 3: Use multiplication to find out how much time you spend in total. Step 4: Add up your daily total to see how much screen time you have in a week. Step 5: See if you can find a pattern – does your screen time change on weekends or school days? Example:
  • On Monday: 2 sessions of 10 minutes each
  • 2 × 10 = 20 minutes
  • On Tuesday: 3 sessions of 5 minutes each
  • 3 × 5 = 15 minutes
  • On Wednesday: 1 session of 30 minutes
  • 1 × 30 = 30 minutes

Common mistakes

  • Mistake: Thinking 5 × 10 = 50 instead of 50
    Why it happens: Confusing multiplication with addition
    Fix: Use arrays or draw groups to check your work
  • Mistake: Adding up time but forgetting to multiply
    Why it happens: Not seeing that groups of the same size can be multiplied
    Fix: Ask, “How many times do I do this?” and then multiply
  • Mistake: Mixing up which number is the group and which is the amount in each group
    Why it happens: Not understanding the meaning of multiplication
    Fix: Use real-life examples like “3 bags with 4 apples each”

Parent and carer guide

Parents and carers can help by:
  • Encouraging children to track screen time using simple multiplication
  • Using a chart or table to show how time adds up
  • Asking questions like, “How many times did you watch a video today?” or “How long was each video?”
  • Helping children make arrays or draw pictures to show their work
  • Practising with real-life screen time, like how long a game takes or how many episodes they watch
What to say:
  • “Let’s see how much time you spent watching shows today!”
  • “You watched 4 videos that were 10 minutes each – how much time is that?”
  • “Can you draw 4 groups of 10 to show how much time you spent?”
What not to worry about:
  • Children may not know all multiplication facts yet – that’s okay
  • It’s normal to use repeated addition at first
  • They’ll get better with practice and visual help

Practice questions

  1. How much time is 5 groups of 10 minutes?
  2. If you play 3 games that each last 15 minutes, how much time do you spend?
  3. You watch 6 episodes, each 20 minutes long. What is the total time?
  4. How much time is 4 groups of 5 minutes?
  5. You play 2 games that each take 25 minutes. What is the total time?
Answers:
  1. 5 × 10 = 50 minutes
  2. 3 × 15 = 45 minutes
  3. 6 × 20 = 120 minutes
  4. 4 × 5 = 20 minutes
  5. 2 × 25 = 50 minutes

FAQ

What is multiplication?

Multiplication is a way to add the same number many times. For example, 3 × 4 means 3 groups of 4, which is 4 + 4 + 4 = 12.

Why do we use multiplication for screen time?

Because screen time is often broken into small parts. Multiplication helps us quickly add those parts together.

Can I use multiplication for other things besides screen time?

Yes! You can use it for counting cookies, time for games, or even how many pages you read each day.

What if I don’t know my multiplication facts?

That’s okay! You can still use repeated addition or draw pictures to solve problems.

How can I practice this at home?

Track how long you spend on different screen activities and multiply the number of times you do them by the length of each activity.