What is Fifty-One (51)? | Simple Explanation for Class 5-10

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What is Fifty-One?

Grade Level:

Pre-School – Class 2

All domains without exception

Definition

What is it?

Fifty-One is a natural number that comes right after fifty (50) and before fifty-two (52). It is written as '51' in digits and 'Fifty-One' in words. It represents a collection of 5 tens and 1 one.

Simple Example

Quick Example

Imagine your school gave you 50 rupees yesterday and your friend gave you 1 more rupee today. How much money do you have in total? You have 50 + 1 = 51 rupees.

Worked Example

Step-by-Step

Let's find out what happens when we add 25 and 26.
---Step 1: Write down the numbers for addition: 25 + 26.
---Step 2: Add the 'ones' digits first: 5 + 6 = 11.
---Step 3: Write down '1' in the ones place and 'carry over' the other '1' to the tens place.
---Step 4: Add the 'tens' digits, including the carried over '1': 2 + 2 + 1 (carry over) = 5.
---Step 5: Write down '5' in the tens place.
---Answer: So, 25 + 26 = 51.

Why It Matters

Understanding numbers like fifty-one helps you count, measure, and calculate things every day. It's a basic building block for math. Knowing numbers well is important for careers like shopkeepers, accountants who manage money, and engineers who design things.

Common Mistakes

MISTAKE: Writing '501' instead of '51' when hearing 'fifty-one'. | CORRECTION: Remember 'fifty-one' means 5 tens and 1 one, which is 51. '501' is 'five hundred one'.

MISTAKE: Confusing the order, thinking fifty-one comes before fifty. | CORRECTION: Fifty-one (51) comes after fifty (50) and before fifty-two (52). Think of counting from 1 to 100.

MISTAKE: Forgetting that 'fifty-one' is an odd number. | CORRECTION: Numbers ending in 1, 3, 5, 7, 9 are odd. Since 51 ends in 1, it is an odd number.

Practice Questions

Try It Yourself

QUESTION: What number comes just before 51? | ANSWER: 50

QUESTION: If you have 40 laddoos and your friend gives you 11 more, how many laddoos do you have in total? | ANSWER: 40 + 11 = 51 laddoos

QUESTION: A cricket team scored 10 runs in the first over, 15 runs in the second, and 26 runs in the third. What is their total score after three overs? | ANSWER: 10 + 15 + 26 = 51 runs

MCQ

Quick Quiz

Which of these numbers is equivalent to 'fifty-one'?

5 + 1

50 + 1

5 + 10

50 + 10

The Correct Answer Is:

Fifty-one means 5 tens and 1 one. So, 50 + 1 correctly represents fifty-one. Options A, C, and D give different values.

Real World Connection

In the Real World

You see '51' in many places! For example, if a mobile recharge pack costs ₹51, or if a bus route is 'Route 51'. Sometimes, cricket players wear jersey number 51. Even in some Indian games, you might need to reach 51 points to win.

Key Vocabulary

Key Terms

NATURAL NUMBER: A counting number starting from 1 (1, 2, 3...). | DIGITS: The symbols used to write numbers (0, 1, 2, ... 9). | PLACE VALUE: The value of a digit based on its position in a number (ones, tens, hundreds). | ODD NUMBER: A whole number that cannot be divided exactly by 2.

What's Next

What to Learn Next

Now that you understand 51, you can explore other numbers like 'What is Sixty?' or 'What is One Hundred?'. This will help you count and do math with even larger numbers more confidently.