X Tables
Swimming Maths

Maths in swimming: lap times

Compare times and improvements.

Quick answer

Maths in swimming: lap times helps you compare how fast you swim and track your progress over time. You can use addition, subtraction, and averages to understand your swimming performance better.

Learning outcome

By the end of this page, you will be able to compare lap times and calculate improvements in swimming. Success signs:
  • You can read and write times in seconds and minutes
  • You can add and subtract lap times
  • You can find the average time for a set of laps
  • You can compare your times to see if you're getting faster

Why this matters

Maths in swimming helps you understand how fast you're going and whether you're improving. When you swim, you often keep track of your lap times to see how you're doing. This is useful for:
  • Setting goals for yourself
  • Knowing when you're getting better
  • Planning your training
  • Competing fairly with others
Even if you're not in a race, knowing how to work with lap times helps you enjoy swimming more. It's like having a scorecard for your swimming adventure!

How it works

Lap times are the amount of time it takes to swim one lap of the pool. To compare lap times, you need to:
  1. Write down the time for each lap
  2. Add up all the times to find the total time
  3. Find the average time per lap
  4. Compare your times to see if you're getting faster
Let's look at how this works step by step.

Examples you can see

Let's imagine you're swimming 4 laps in a pool. Here are your times:
  • Lap 1: 45 seconds
  • Lap 2: 50 seconds
  • Lap 3: 48 seconds
  • Lap 4: 52 seconds
To find the total time, you add all the lap times together: 45 + 50 + 48 + 52 = 195 seconds To find the average time per lap, you divide the total time by the number of laps: 195 ÷ 4 = 48.75 seconds per lap So, your average time is 48.75 seconds per lap. Let's say you did the same swim the next week and got these times:
  • Lap 1: 42 seconds
  • Lap 2: 47 seconds
  • Lap 3: 45 seconds
  • Lap 4: 49 seconds
Total time: 42 + 47 + 45 + 49 = 183 seconds Average time: 183 ÷ 4 = 45.75 seconds per lap Now you can compare your two swims:
  • First swim average: 48.75 seconds
  • Second swim average: 45.75 seconds
You're getting faster! You're swimming 3 seconds faster per lap.

Try it as a mini adventure

Adventure: Swimming Time Tracker You are a swimming coach helping your friend track their lap times. Here's what you need to do:
  1. Swim 5 laps and write down your time for each lap
  2. Add up all your lap times to find the total
  3. Find the average time per lap
  4. Compare your times to see if you're improving
Here's a table to help you:
Lap Time (seconds)
1st ?
2nd ?
3rd ?
4th ?
5th ?
Total time: ? + ? + ? + ? + ? = ? seconds Average time: ? ÷ 5 = ? seconds per lap Now, compare your times to see if you're getting faster or slower.

Common mistakes

  • Mistake: Forgetting to convert minutes to seconds when adding times
    • Why it happens: Children might not understand that 1 minute = 60 seconds
    • Fix: Always remember to convert minutes to seconds before adding. If you have 1 minute 30 seconds, that's 90 seconds
  • Mistake: Adding times incorrectly when they're in different units
    • Why it happens: Mixing up seconds and minutes without converting
    • Fix: Convert everything to seconds first, then add
  • Mistake: Not knowing how to find an average
    • Why it happens: Not understanding that average means total divided by number of things
    • Fix: Remember: average = total ÷ number of laps

Parent and carer guide

Parents and carers can help children with swimming lap times by:
  • Using a stopwatch or timer to record lap times
  • Writing times down in a simple table
  • Practicing addition and division with real lap times
  • Encouraging children to compare times and notice improvements
  • Helping children convert minutes to seconds when needed
To help your child:
  • Ask them to tell you how they did in their swim
  • Work together to add up lap times
  • Discuss whether they're getting faster or slower
  • Use real-world examples like race times or training times
Remember, it's not about being perfect – it's about learning and improving!

Practice questions

  1. Sam swims 3 laps with times: 30 seconds, 35 seconds, 32 seconds. What is the total time?
  2. Lily swims 4 laps with times: 40 seconds, 42 seconds, 38 seconds, 41 seconds. What is the average time per lap?
  3. Tom swims 5 laps with times: 50 seconds, 52 seconds, 48 seconds, 51 seconds, 49 seconds. What is the total time?
  4. Amy swims 4 laps with times: 36 seconds, 38 seconds, 35 seconds, 37 seconds. What is the average time?
  5. Ben swims 3 laps with times: 45 seconds, 47 seconds, 43 seconds. What is the total time?
Answers:
  1. 30 + 35 + 32 = 97 seconds
  2. (40 + 42 + 38 + 41) ÷ 4 = 161 ÷ 4 = 40.25 seconds
  3. 50 + 52 + 48 + 51 + 49 = 250 seconds
  4. (36 + 38 + 35 + 37) ÷ 4 = 146 ÷ 4 = 36.5 seconds
  5. 45 + 47 + 43 = 135 seconds

FAQ

What is a lap time?

A lap time is how long it takes to swim one lap of a pool.

How do I add lap times together?

Add all the lap times together. If you have times in minutes and seconds, convert everything to seconds first, then add.

How do I find the average lap time?

Add up all the lap times, then divide by the number of laps.

Why do we need to know lap times?

Lap times help you see how fast you're going and track your progress. They're useful for training and competitions.

Can I use lap times to compare different swimmers?

Yes! You can compare lap times to see who is faster, or to track how well you're doing over time.