What is the Less Than Sign?

S0-SA1-0024

Grade Level:

Class 1

Maths, Logic, Computing, AI

Definition

What is it?

The Less Than Sign is a mathematical symbol that looks like a sideways 'V' pointing to the left (<). It is used to show that the number or value on its left side is smaller than the number or value on its right side. Think of it as an open mouth always wanting to eat the bigger number!

Simple Example

Quick Example

Imagine you have 5 ladoos and your friend has 8 ladoos. To show that you have fewer ladoos than your friend, we would write: 5 < 8. This means 5 is less than 8.

Worked Example

Step-by-Step

Let's compare the scores of two cricket teams in a T20 match.

Step 1: Team A scored 150 runs.
---Step 2: Team B scored 165 runs.
---Step 3: We want to show which team scored less.
---Step 4: Compare 150 and 165.
---Step 5: Since 150 is smaller than 165, we use the Less Than Sign.
---Step 6: We write it as 150 < 165.
---Answer: Team A's score (150) is less than Team B's score (165).

Why It Matters

Understanding the Less Than sign is crucial for basic maths and logic, which are building blocks for computing and AI. Engineers use it to compare data, programmers use it to make decisions in code, and data scientists use it to analyze trends. It's a fundamental concept for anyone working with numbers!

Common Mistakes

MISTAKE: Confusing the Less Than sign (<) with the Greater Than sign (>) | CORRECTION: Remember the Less Than sign points to the left, like the 'L' in 'Less' (if you stretch your imagination!). The open mouth always faces the bigger number.

MISTAKE: Placing the smaller number on the right side of the sign | CORRECTION: The smaller number ALWAYS goes on the left side of the Less Than sign (<), and the larger number goes on the right.

MISTAKE: Thinking the sign always points towards the smaller number | CORRECTION: The 'open mouth' of the sign always faces the LARGER number, while the 'pointy end' faces the smaller number.

Practice Questions

Try It Yourself

QUESTION: Fill in the blank with the correct sign: 12 ___ 20 | ANSWER: 12 < 20

QUESTION: Your mobile data plan gives you 2 GB per day. Your friend's plan gives 1.5 GB per day. Write a comparison using the Less Than sign. | ANSWER: 1.5 GB < 2 GB

QUESTION: A chaiwalla sells 55 cups of chai on Monday and 48 cups on Tuesday. Which day did he sell less chai? Write the comparison using the Less Than sign. | ANSWER: Tuesday (48 < 55)

MCQ

Quick Quiz

Which of these statements correctly uses the Less Than sign?

100 < 50

75 < 70

25 < 30

90 < 85

The Correct Answer Is:

Option C (25 < 30) is correct because 25 is indeed smaller than 30. All other options incorrectly show a larger number as being less than a smaller number.

Real World Connection

In the Real World

When you use an app like Zomato or Swiggy to order food, the app often sorts restaurants by price, delivery time, or ratings. It uses logic involving 'less than' comparisons to show you options that are cheaper or faster. For example, it might show you restaurants where 'delivery time < 30 minutes' or 'price < Rs. 200'.

Key Vocabulary

Key Terms

LESS THAN: Smaller in amount or value | SYMBOL: A mark or character used as a conventional representation of an object, function, or process | COMPARE: To estimate, measure, or note the similarity or dissimilarity between two or more things | VALUE: The numerical amount denoted by a numeral or symbol

What's Next

What to Learn Next

Now that you understand the Less Than sign, you should definitely learn about the Greater Than sign (>). These two symbols are like siblings and are often used together to compare numbers and quantities in daily life and in programming!