What is 1 + 3?

S1-SA1-0627

Grade Level:

Class 1

Maths, Computing, AI

Definition

What is it?

1 + 3 is a basic addition problem. It means combining one item with three more items to find the total count. Addition helps us find the sum of two or more numbers.

Simple Example

Quick Example

Imagine you have 1 cricket ball. Your friend gives you 3 more cricket balls. To find out how many cricket balls you have in total, you add 1 and 3.

Worked Example

Step-by-Step

Let's find the total for 1 + 3:
Step 1: Start with the first number, which is 1.
---Step 2: Now, count forward 3 steps from 1. So, 1... (count) 2, 3, 4.
---Step 3: After counting 3 steps from 1, you land on the number 4.
---Answer: So, 1 + 3 = 4.

Why It Matters

Understanding addition is the first step in Maths, which is crucial for computing and AI. Engineers use addition to design circuits, and data scientists use it to sum up information. Even game developers use addition to calculate scores or distances.

Common Mistakes

MISTAKE: Counting the first number twice (e.g., for 1+3, counting 1, 2, 3, 4, 5) | CORRECTION: Start counting *from* the first number, then count *up* the second number of times. So, from 1, count '2, 3, 4'.

MISTAKE: Mixing up addition with subtraction (e.g., thinking 1 + 3 means taking away 3 from 1) | CORRECTION: Addition means putting things together or finding a total. Subtraction means taking away.

MISTAKE: Not understanding that the order doesn't change the sum (e.g., thinking 1 + 3 is different from 3 + 1) | CORRECTION: For addition, 1 + 3 gives the same answer as 3 + 1. Both equal 4.

Practice Questions

Try It Yourself

QUESTION: If you have 1 samosa and buy 3 more, how many samosas do you have in total? | ANSWER: 4 samosas

QUESTION: Your mobile data pack has 1 GB left. You recharge with a 3 GB pack. How much total data do you have now? | ANSWER: 4 GB

QUESTION: A small auto-rickshaw ride costs 1 Rupee. If you take 3 more similar rides, what is the total cost? | ANSWER: 4 Rupees

MCQ

Quick Quiz

What is the result of adding 1 and 3?

The Correct Answer Is:

Adding 1 and 3 means combining them. If you have 1 and add 3 more, you get 4. So, 1 + 3 = 4.

Real World Connection

In the Real World

When you use UPI to send money, the app adds up different charges or items in your cart before showing the total. Even a street vendor adding up the cost of your chai and pakoras is doing 1 + 3 type of addition in their mind.

Key Vocabulary

Key Terms

ADDITION: The process of combining numbers to find a total | SUM: The total result obtained from adding numbers | NUMBER LINE: A straight line with numbers placed at equal intervals | TOTAL: The complete amount or number of something

What's Next

What to Learn Next

Great job understanding 1 + 3! Next, you can explore adding larger numbers and then move on to addition with more than two numbers. This will help you solve bigger problems easily.