Where is subtraction hiding in Mario Kart split times?

Quick answer

Subtraction hides in Mario Kart split times when you compare how long each section of the race took. You subtract the time of one lap from the next to see if a racer gained or lost time.

Learning outcome

By the end of this page, you will be able to find the difference between two times to see if someone got faster or slower in a race.

• You can compare two times and say which is longer or shorter
• You can subtract times to see how many seconds someone gained or lost
• You can use this to track a racer's progress in a race
• You can play a mini game to practice subtracting times

Why this matters

Subtraction helps you understand how fast or slow someone is going in a race. In Mario Kart, racers try to go as fast as possible, but sometimes they slow down. By subtracting times, you can see where they lost or gained seconds. This is the same as working out how much time you saved or wasted when you race your bike or run a race.

How it works

When you look at split times, you are seeing how long each section of a race took. To find the difference, you subtract the first time from the second time. If the result is positive, the racer was slower. If the result is negative, the racer was faster. For example:

1. First lap: 45 seconds
2. Second lap: 42 seconds
3. 42 - 45 = -3 seconds
4. The racer was 3 seconds faster

Examples you can see

Imagine you're watching a Mario Kart race. The split times for the first few laps are:

From this, you can see that the racer was fastest on lap 2 (3 seconds faster) and slowest on lap 3 (5 seconds slower).

Try it as a mini adventure

Let’s go on a mini Mario Kart race adventure! You are a racer in a race with 4 laps. You want to track your progress. Here's your plan:

1. First lap: 50 seconds
2. Second lap: 48 seconds
3. Third lap: 52 seconds
4. Fourth lap: 49 seconds

Your challenge: Calculate the time difference for each lap compared to the previous one. Did you get faster or slower?

Step 1: Lap 1 to Lap 2: 48 - 50 = -2 seconds (faster)

Step 2: Lap 2 to Lap 3: 52 - 48 = +4 seconds (slower)

Step 3: Lap 3 to Lap 4: 49 - 52 = -3 seconds (faster)

Great job! You were fastest on lap 2 and lap 4, but slowest on lap 3.

Common mistakes

• Mistake: Forgetting that a negative difference means you were faster.
• Why it happens: Children often think that a smaller number means slower.
• Fix: Remember that if you finish a lap in less time, the difference is negative, which means you were faster.

• Mistake: Subtracting in the wrong order.
• Why it happens: Children may subtract the second time from the first instead of the first from the second.
• Fix: Always subtract the previous lap time from the current lap time.

• Mistake: Adding or subtracting minutes and seconds incorrectly.
• Why it happens: Children might not understand that 60 seconds = 1 minute.
• Fix: Break times into minutes and seconds. For example, 75 seconds = 1 minute 15 seconds.

Parent and carer guide

As a parent or carer, you can help by:

• Playing a simple game with your child using stopwatch times
• Using a timer to time laps in a race or play
• Encouraging your child to talk through the steps of subtracting times
• Using real-world examples like walking to school or cooking to practice subtraction
• Noticing when your child makes mistakes and gently correcting them

It’s okay if your child gets confused at first. Subtraction with time is tricky, but practice makes progress!

Practice questions

1. First lap: 48 seconds. Second lap: 50 seconds. What is the difference?
2. First lap: 55 seconds. Second lap: 52 seconds. What is the difference?
3. First lap: 40 seconds. Second lap: 43 seconds. What is the difference?
4. First lap: 51 seconds. Second lap: 49 seconds. What is the difference?
5. First lap: 46 seconds. Second lap: 46 seconds. What is the difference?

Answers:

1. 50 - 48 = +2 seconds (slower)
2. 52 - 55 = -3 seconds (faster)
3. 43 - 40 = +3 seconds (slower)
4. 49 - 51 = -2 seconds (faster)
5. 46 - 46 = 0 seconds (same time)

FAQ

How do you subtract times?

You subtract the time of the first lap from the time of the second lap. If the result is positive, the racer was slower. If the result is negative, the racer was faster.

Why do we use subtraction in races?

Subtraction helps us see how much faster or slower someone is compared to their previous time. This helps us track progress and strategy in a race.

Can you use subtraction for times that include minutes?

Yes! You can break the times into minutes and seconds. For example, 1 minute 30 seconds minus 1 minute 15 seconds equals 15 seconds.

What if the times are the same?

If the times are the same, the difference is zero. This means the racer did not gain or lose any time.

How can I practice this at home?

You can time yourself doing different activities, like jumping rope or reading a page, and then subtract the times to see how you improved.