What is Seventeen?

S0-SA1-0228

Grade Level:

Pre-School – Class 2

All domains without exception

Definition

What is it?

Seventeen is the natural number that comes right after sixteen and just before eighteen. It is an odd number, meaning it cannot be divided equally by two, and it is also a prime number, which means it can only be divided exactly by 1 and itself.

Simple Example

Quick Example

Imagine your favourite cricket team scored 16 runs in an over. If they hit one more run, their total score for that over would become seventeen. So, 16 + 1 = 17.

Worked Example

Step-by-Step

Let's say you have 10 colourful marbles. Your friend gives you 7 more marbles.
---How many marbles do you have in total?
---Step 1: Start with the number of marbles you have: 10.
---Step 2: Add the number of marbles your friend gave you: + 7.
---Step 3: Count forward 7 steps from 10 (11, 12, 13, 14, 15, 16, 17).
---Total marbles: 17.
---Answer: You have 17 marbles in total.

Why It Matters

Understanding numbers like seventeen is fundamental to all of mathematics and science. It's used in counting, calculating scores in sports, managing money, and even in computer programming. Engineers use numbers daily, and even doctors count things like heartbeats or medicine doses.

Common Mistakes

MISTAKE: Confusing seventeen with seventy | CORRECTION: Remember 'seventeen' has 'teen' at the end, meaning it's a small number, while 'seventy' is much larger.

MISTAKE: Thinking seventeen is an even number | CORRECTION: An even number can be divided equally by 2. Seventeen leaves 1 leftover when divided by 2, so it's an odd number.

MISTAKE: Writing 17 as 'seven-teen' or 'seven ten' | CORRECTION: The correct spelling is 'seventeen', written as one word.

Practice Questions

Try It Yourself

QUESTION: If you have 15 rupees and find 2 more rupees, how much money do you have? | ANSWER: 17 rupees

QUESTION: Count the number of fingers on one hand and the number of fingers on another hand. Add them together. Now, add 7 more. What is the total? | ANSWER: 17 (5 + 5 + 7 = 17)

QUESTION: Your elder sister is 17 years old. Your younger brother is 5 years younger than her. How old is your younger brother? | ANSWER: 12 years (17 - 5 = 12)

MCQ

Quick Quiz

Which of these describes the number seventeen?

It is an even number.

It is a prime number.

It comes after eighteen.

It can be divided equally by 3.

The Correct Answer Is:

Seventeen is a prime number because it can only be divided by 1 and itself. It is an odd number, comes before eighteen, and cannot be divided equally by 3.

Real World Connection

In the Real World

In cricket, a batsman might score 17 runs in an innings. When you recharge your mobile, you might get a data pack valid for 17 days. Even when you count the number of students in a small class or the number of books on a shelf, you might find there are seventeen of them.

Key Vocabulary

Key Terms

NATURAL NUMBER: A counting number starting from 1 (1, 2, 3...). | ODD NUMBER: A number that cannot be divided exactly by 2. | PRIME NUMBER: A number greater than 1 that has only two factors: 1 and itself. | COUNTING: The act of determining the total number of objects in a set.

What's Next

What to Learn Next

Now that you understand what seventeen is, you can explore other numbers! Next, you can learn about 'What is Eighteen?' to see how numbers grow and how they are ordered in our number system. Keep counting!