What is Before (Number)?

S0-SA1-0077

Grade Level:

Pre-School

Maths, Computing

Definition

What is it?

When we talk about 'What is Before (Number)?', we are asking for the number that comes immediately before a given number when we count. It's the number that is one less than the number you are looking at. Think of it as taking one step backward on the number line.

Simple Example

Quick Example

Imagine you are watching a cricket match and the score is 150 runs. If you want to know what score came just before 150, you would think of 149. So, 149 is the number before 150.

Worked Example

Step-by-Step

Let's find the number that comes before 7.
---Step 1: Understand what 'before' means. It means 'one less than'.
---Step 2: Start with the given number, which is 7.
---Step 3: To find the number before 7, we subtract 1 from 7.
---Step 4: 7 - 1 = 6.
---Answer: The number before 7 is 6.

Why It Matters

Understanding 'before' is fundamental to counting and basic arithmetic, which are building blocks for all of Maths and Computing. This skill is crucial for careers like data analysis, where you track previous values, or in software development, where you might need to access the previous item in a list.

Common Mistakes

MISTAKE: Saying the number after instead of before (e.g., for 5, saying 6) | CORRECTION: Always think 'one less' or 'take one step back' to find the number before.

MISTAKE: Getting confused when the number is a multiple of 10 (e.g., for 20, saying 10) | CORRECTION: Remember to subtract only 1. For 20, subtracting 1 gives 19.

MISTAKE: Forgetting to subtract 1 and just guessing any smaller number | CORRECTION: The number 'before' is always the *immediate* previous number, which means exactly one less.

Practice Questions

Try It Yourself

QUESTION: What number comes before 12? | ANSWER: 11

QUESTION: Your mom asks you to buy 30 rotis. If you have already made one, how many were there before you made the current one? | ANSWER: 29

QUESTION: If today is the 15th day of the month, what date was it two days before today? (Hint: First find the number before 15, then find the number before that result) | ANSWER: 13

MCQ

Quick Quiz

Which number comes immediately before 45?

The Correct Answer Is:

The number immediately before 45 is found by subtracting 1 from 45, which gives 44. Options A, C, and D are either after 45 or not immediately before it.

Real World Connection

In the Real World

When you are watching a YouTube video or scrolling through photos on your phone, you often see 'Previous' and 'Next' buttons. The 'Previous' button takes you to the item that was 'before' the current one. Similarly, in a game, if you are on Level 5, the 'previous' level was Level 4.

Key Vocabulary

Key Terms

BEFORE: The number that comes immediately preceding another number | COUNTING: Saying numbers in order | SUBTRACT: To take away one quantity from another | NUMBER LINE: A visual representation of numbers in order

What's Next

What to Learn Next

Now that you understand 'before', you should learn about 'What is After (Number)?'. This will help you understand how numbers follow each other in sequence, which is vital for building a strong foundation in arithmetic and number patterns.