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What is 1 + 9?
Grade Level:
Class 1
Maths, Computing, AI
Definition
What is it?
1 + 9 is an addition problem asking us to combine the number 1 and the number 9. Addition means putting groups of items together to find the total count.
Simple Example
Quick Example
Imagine you have 1 cricket ball. Your friend gives you 9 more cricket balls. How many cricket balls do you have now? You add them together to find the total.
Worked Example
Step-by-Step
Let's find the sum of 1 and 9.
Step 1: Start with the first number, which is 1.
---Step 2: Now, we need to add 9 to it. Think of counting forward 9 steps from 1.
---Step 3: If you have 1 item, and you add 9 more items, you can count them all.
---Step 4: Count: 1 (start), then 2, 3, 4, 5, 6, 7, 8, 9, 10.
---Step 5: So, after adding 9 to 1, you reach the number 10.
---Answer: 1 + 9 = 10.
Why It Matters
Understanding basic addition like 1 + 9 is the first step towards solving complex problems in Maths, Computing, and even AI. Engineers use addition to calculate distances for rockets, programmers use it in game development, and data scientists use it to sum up information.
Common Mistakes
MISTAKE: Counting only 9 numbers after 1 (e.g., 2, 3, ..., 10) and forgetting to include 1 itself in the count if starting from zero. | CORRECTION: When adding 9 to 1, you start *from* 1 and count 9 more steps forward. So, 1 + 9 means '1, then add 9 more to it'.
MISTAKE: Confusing addition with multiplication, thinking 1 + 9 is the same as 1 x 9. | CORRECTION: Addition combines quantities, while multiplication is repeated addition. 1 + 9 is 10, but 1 x 9 is 9.
MISTAKE: Miscounting when using fingers or drawing lines, especially if the numbers are small and easy to mix up. | CORRECTION: Always double-check your count. Use number lines or mental counting to be sure you've added the correct amount.
Practice Questions
Try It Yourself
QUESTION: You have 1 rupee coin. Your mother gives you 9 more 1-rupee coins. How many rupees do you have now? | ANSWER: 10 rupees
QUESTION: A bus has 1 passenger. At the next stop, 9 more passengers get on. What is the total number of passengers on the bus? | ANSWER: 10 passengers
QUESTION: If you score 1 mark in Science and 9 marks in English, what is your total score for these two subjects? | ANSWER: 10 marks
MCQ
Quick Quiz
What is the result of adding 1 and 9?
8
9
10
11
The Correct Answer Is:
C
When you add 1 and 9, you combine them to get a total of 10. Options A, B, and D are incorrect sums of 1 and 9.
Real World Connection
In the Real World
Every day, we use addition. When you buy a packet of biscuits for 10 rupees and a chai for 10 rupees, the shopkeeper adds 10 + 10 to tell you the total. Even simple additions like 1 + 9 are building blocks for calculating bigger sums, like your total mobile data usage or the total score in a cricket match.
Key Vocabulary
Key Terms
ADDITION: The process of combining two or more numbers to find their total sum | SUM: The total amount obtained when two or more numbers are added together | TOTAL: The whole amount or number | NUMBER LINE: A straight line with numbers placed at equal intervals along its length
What's Next
What to Learn Next
Great job understanding 1 + 9! Next, you can learn about adding larger numbers, like 10 + 20, or addition with three numbers. These concepts build on the simple addition you just learned, helping you solve more complex real-world problems.
