Inaugurated by IN-SPACe
ISRO Registered Space Tutor
S0-SA1-1024
What is Thirty-Nine?
Grade Level:
Pre-School – Class 2
All domains without exception
Definition
What is it?
Thirty-Nine is a whole number that comes after 38 and before 40. It is written as '39' using the digits 3 and 9. It represents a quantity of 3 tens and 9 ones.
Simple Example
Quick Example
Imagine you have 3 packets of biscuits, and each packet has 10 biscuits. That's 30 biscuits. Now, if you also have 9 loose biscuits, then in total you have 30 + 9 = 39 biscuits.
Worked Example
Step-by-Step
Let's count up to Thirty-Nine.
Step 1: Start counting from 1: 1, 2, 3, ...
---Step 2: Continue counting until you reach the numbers in the thirties: ..., 31, 32, 33, ...
---Step 3: Keep going past thirty-eight: ..., 37, 38.
---Step 4: The very next number after 38 is Thirty-Nine.
---Step 5: So, Thirty-Nine is the number you get when you add 1 to 38 (38 + 1 = 39).
Answer: Thirty-Nine is the number 39.
Why It Matters
Understanding numbers like Thirty-Nine is fundamental to all mathematics and everyday life. It's crucial for counting, measuring, and calculating. Careers like banking, engineering, and even running a small business rely heavily on knowing numbers and their values.
Common Mistakes
MISTAKE: Writing '309' instead of '39' for Thirty-Nine. | CORRECTION: Remember 'thirty' means 3 tens, and 'nine' means 9 ones. So, it's 3 followed by 9, making 39.
MISTAKE: Confusing Thirty-Nine (39) with Nine-Three (93). | CORRECTION: The order of digits matters! 39 is much smaller than 93. 39 means 3 tens and 9 ones, while 93 means 9 tens and 3 ones.
MISTAKE: Thinking 'Thirty-Nine' is '3 and 9' as separate numbers. | CORRECTION: 'Thirty-Nine' is a single number, a quantity. It's not two separate numbers, 3 and 9, but rather the number formed by putting 3 in the tens place and 9 in the ones place.
Practice Questions
Try It Yourself
QUESTION: What number comes just before Thirty-Nine? | ANSWER: 38
QUESTION: If you have two groups of ten pens and then nineteen more pens, how many pens do you have in total? | ANSWER: 20 + 19 = 39 pens
QUESTION: A bus can carry 40 passengers. If there are 39 passengers on the bus, how many more passengers can still get on? | ANSWER: 40 - 39 = 1 passenger
MCQ
Quick Quiz
Which of these represents Thirty-Nine?
309
39
93
3 and 9
The Correct Answer Is:
B
Option B, '39', is the correct way to write Thirty-Nine. It has 3 in the tens place and 9 in the ones place. Other options are incorrect representations of Thirty-Nine.
Real World Connection
In the Real World
When you check the score of a cricket match, you might see a batsman has scored 39 runs. Or, if you're buying snacks, the shopkeeper might tell you the total bill is 39 rupees. Even your mobile phone's battery percentage or the number of new messages can sometimes be 39.
Key Vocabulary
Key Terms
DIGIT: A single symbol used to write numbers (0, 1, 2, 3, 4, 5, 6, 7, 8, 9) | WHOLE NUMBER: A number without fractions or decimals (0, 1, 2, 3...) | PLACE VALUE: The value of a digit based on its position in a number (e.g., in 39, 3 is in the tens place) | QUANTITY: How much of something there is
What's Next
What to Learn Next
Great job understanding Thirty-Nine! Next, you can learn about 'What is Forty?'. This will help you continue your journey through numbers, understanding how they follow each other and form patterns, which is essential for addition and subtraction.
