What is the Number After?

S0-SA1-1390

Grade Level:

Pre-School – Class 2

All domains without exception

Definition

What is it?

The 'number after' (also called a successor) is simply the next whole number in the counting sequence. You find it by adding 1 to the given number. It helps us understand the order and progression of numbers.

Simple Example

Quick Example

Imagine you scored 89 marks in your Maths exam. If your friend asked, 'What is the number after 89?', you would say 90. This means 90 is the next mark you could score, or the next number in the counting order.

Worked Example

Step-by-Step

Let's find the number after 145.

1. Start with the given number: 145.
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2. To find the number after, we always add 1 to the given number.
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3. So, we calculate: 145 + 1.
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4. Adding 1 to 145 gives us 146.
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ANSWER: The number after 145 is 146.

Why It Matters

Understanding the 'number after' is a basic building block for all math. It's crucial for counting, ordering, and even understanding data sequences. Engineers use it to number parts, software developers use it in coding sequences, and even economists use it when looking at data trends over time.

Common Mistakes

MISTAKE: Subtracting 1 instead of adding 1. Forgetting that 'after' means increasing. | CORRECTION: Always remember 'after' means moving forward in the number line, so you add 1.

MISTAKE: Confusing 'number after' with 'number before'. | CORRECTION: 'Number after' means the next number (add 1). 'Number before' means the previous number (subtract 1).

MISTAKE: Making a calculation error when adding 1, especially with numbers ending in 9 (e.g., 29 + 1 = 20). | CORRECTION: Pay close attention to place value when adding 1. For 29 + 1, the ones digit becomes 0 and the tens digit increases, making it 30.

Practice Questions

Try It Yourself

QUESTION: What is the number after 7? | ANSWER: 8

QUESTION: My mobile data pack has 49 MB left. What will be the next whole MB number if I use 1 MB? | ANSWER: 50 MB

QUESTION: If a train is at platform number 19, and the next platform in the sequence is the 'number after' 19, what is that platform number? | ANSWER: 20

MCQ

Quick Quiz

Which of these is the number after 99?

100

991

101

The Correct Answer Is:

To find the number after 99, you add 1 to it (99 + 1). This gives you 100. Options A, C, and D are incorrect because they are either before 99, or incorrect additions.

Real World Connection

In the Real World

When you're waiting for your turn at the bank or a doctor's clinic, your token number is 25. The person called next will have the number after 25, which is 26. This sequential numbering helps manage queues efficiently, just like in many government offices or even when booking tickets online.

Key Vocabulary

Key Terms

SUCCESSOR: The number that comes immediately after another number. | COUNTING SEQUENCE: The order in which numbers are spoken or written. | ADDITION: The process of combining two or more numbers to find their total. | PLACE VALUE: The value of a digit based on its position in a number.

What's Next

What to Learn Next

Now that you understand the 'number after', you can explore the 'number before' (also called a predecessor). This will further strengthen your understanding of number order and how numbers relate to each other on the number line.