What is The Number 45?

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Grade Level:

Pre-School – Class 2

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Definition

What is it?

The number 45 is a whole number that comes after 44 and before 46. It is a two-digit number, meaning it has a 'tens' place and a 'ones' place. The '4' in 45 represents four tens (40), and the '5' represents five ones.

Simple Example

Quick Example

Imagine you have 45 rupees in your piggy bank. This means you have enough money to buy a small packet of biscuits that costs 20 rupees and still have 25 rupees left. Or, if your favourite cricketer scores 45 runs in a match, it means they are close to scoring a half-century!

Worked Example

Step-by-Step

Let's say you want to count 45 items.

Step 1: Start counting from 1: 1, 2, 3...
---Step 2: Continue counting past numbers like 10, 20, 30.
---Step 3: Reach 40. Now you need to count 5 more.
---Step 4: Count 41, 42, 43, 44, 45.
---Step 5: You have now counted exactly 45 items.

So, 45 is the count you reach after 44.

Why It Matters

Understanding numbers like 45 is crucial for everyday life, from managing your pocket money to understanding scores in a cricket match. It's a basic building block for all of mathematics, used by scientists, engineers, and even shopkeepers to count and calculate.

Common Mistakes

MISTAKE: Confusing 45 with 54. | CORRECTION: Remember that the first digit tells you the number of tens. 45 has '4' tens and '5' ones, while 54 has '5' tens and '4' ones.

MISTAKE: Thinking 45 is a single digit. | CORRECTION: 45 is a two-digit number. The '4' is in the tens place, and the '5' is in the ones place.

MISTAKE: Miscounting when reaching 45, e.g., skipping from 43 to 45. | CORRECTION: Always count one by one, carefully: 43, 44, 45. Practice counting aloud.

Practice Questions

Try It Yourself

QUESTION: If you have 40 lollipops and your friend gives you 5 more, how many lollipops do you have in total? | ANSWER: 45 lollipops

QUESTION: Write the number that comes just before 45 and the number that comes just after 45. | ANSWER: Before: 44, After: 46

QUESTION: A bus has 45 seats. If 20 passengers are already seated, how many more passengers can sit? | ANSWER: 25 passengers (45 - 20 = 25)

MCQ

Quick Quiz

Which of these statements about the number 45 is TRUE?

It is a single-digit number.

It comes after 46.

It has 4 tens and 5 ones.

It is an odd number and comes before 44.

The Correct Answer Is:

Option C is correct because 45 is made up of 4 tens (40) and 5 ones. Option A is wrong as it's a two-digit number. Option B is wrong as it comes before 46. Option D is wrong because it comes after 44.

Real World Connection

In the Real World

You see the number 45 everywhere in India! A shopkeeper might calculate that they sold 45 packets of biscuits today. Your mobile data plan might give you 45 GB of data per month. Even the number of minutes in a half of a football match (45 minutes) is a common use of this number.

Key Vocabulary

Key Terms

WHOLE NUMBER: A number without fractions or decimals (0, 1, 2, 3...). | TWO-DIGIT NUMBER: A number made up of two digits (e.g., 10, 45, 99). | TENS PLACE: The position of a digit representing groups of ten. | ONES PLACE: The position of a digit representing single units.

What's Next

What to Learn Next

Great job understanding 45! Next, you should learn about 'Place Value' in more detail. This will help you understand how the position of a digit changes its value, which is super important for larger numbers and more complex math.