What is 3 + 7?

S1-SA1-0645

Grade Level:

Class 1

Maths, Computing, AI

Definition

What is it?

3 + 7 is an addition problem asking us to combine the number 3 and the number 7. Addition means putting numbers together to find their total sum. When we add 3 and 7, we find out how many items we have in total if we start with 3 and then add 7 more.

Simple Example

Quick Example

Imagine you have 3 ladoos in a box. Your friend gives you 7 more ladoos. How many ladoos do you have now? You combine the 3 you had with the 7 your friend gave you. So, 3 + 7 = 10 ladoos.

Worked Example

Step-by-Step

Let's calculate 3 + 7 using a number line:
1. Start at the number 3 on the number line.
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2. We need to add 7, so we will make 7 jumps forward from 3.
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3. First jump: 3 to 4
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4. Second jump: 4 to 5
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5. Third jump: 5 to 6
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6. Fourth jump: 6 to 7
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7. Fifth jump: 7 to 8
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8. Sixth jump: 8 to 9
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9. Seventh jump: 9 to 10
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So, 3 + 7 = 10.

Why It Matters

Understanding addition is super important for almost everything in Maths, Computing, and even AI! Engineers use addition to calculate forces, and data scientists use it to sum up information. Even your phone's calculator uses addition to help you manage your budget or split a bill with friends.

Common Mistakes

MISTAKE: Counting 3 and 7 separately and not combining them. For example, just saying '3 and 7' instead of a total. | CORRECTION: Always combine the numbers to find a single total. Think of it as putting two groups together.

MISTAKE: Counting backward or subtracting instead of adding. For example, thinking 7 - 3 = 4. | CORRECTION: Remember, the '+' sign means to add, which makes the number bigger. Subtraction uses a '-' sign.

MISTAKE: Missing a count when using fingers or a number line. For example, counting only 6 jumps instead of 7. | CORRECTION: Double-check your counting. It helps to say the numbers out loud as you count each jump or finger.

Practice Questions

Try It Yourself

QUESTION: You have 5 cricket balls and buy 5 more. How many do you have in total? | ANSWER: 10

QUESTION: Your mom gives you Rs. 3 for chai and your dad gives you Rs. 7. How much money do you have to buy chai? | ANSWER: Rs. 10

QUESTION: A delivery rider has 3 parcels to deliver in Sector 1 and 7 parcels to deliver in Sector 2. If they deliver all parcels, how many did they deliver in total for both sectors? | ANSWER: 10 parcels

MCQ

Quick Quiz

What is the sum of 3 and 7?

The Correct Answer Is:

The sum of 3 and 7 means adding them together. When you add 3 and 7, you get 10. Options A, C, and D are incorrect because they represent subtraction, one of the numbers, or the other number.

Real World Connection

In the Real World

When you use a UPI app like PhonePe or Google Pay to send money, the app adds up all your transactions. Or, when you check your mobile data usage, your phone's system adds up all the small amounts of data you've used to show you the total. This basic addition is happening behind the scenes!

Key Vocabulary

Key Terms

ADDITION: The process of combining numbers to find a total | SUM: The result of adding two or more numbers | TOTAL: The complete amount or number of items | COMBINE: To put two or more things together

What's Next

What to Learn Next

Great job understanding 3 + 7! Next, you can learn about adding larger numbers, like 13 + 7, or even adding three numbers together. This will help you solve even bigger math problems with confidence.