Inaugurated by IN-SPACe
ISRO Registered Space Tutor
S0-SA1-1389
What is the Number Before?
Grade Level:
Pre-School – Class 2
All domains without exception
Definition
What is it?
The 'number before' a given number is the number that comes immediately before it when counting upwards. It is also known as the predecessor of a number. You find it by subtracting 1 from the original number.
Simple Example
Quick Example
Imagine your favourite cricketer scored 50 runs in a match. What was his score just before he reached 50? It was 49 runs. So, 49 is the number before 50.
Worked Example
Step-by-Step
Let's find the number before 15.
Step 1: Understand the question. We need the number that comes right before 15 when counting.
---Step 2: Remember that finding the number before means subtracting 1 from the given number.
---Step 3: Write down the number: 15.
---Step 4: Subtract 1 from 15. So, 15 - 1.
---Step 5: Perform the subtraction: 15 - 1 = 14.
---Answer: The number before 15 is 14.
Why It Matters
Understanding 'number before' is super important for basic counting, sequencing, and understanding number lines. It's used in careers like data analysis to sort information, in logistics to plan delivery routes, and even by coders to manage sequences in programs.
Common Mistakes
MISTAKE: Adding 1 instead of subtracting 1. For example, thinking the number before 8 is 9. | CORRECTION: Always subtract 1 from the given number to find the number before.
MISTAKE: Getting confused with negative numbers, for example, thinking the number before -5 is -4. | CORRECTION: When moving left on the number line (finding the number before), the number becomes smaller. So, -5 - 1 = -6. The number before -5 is -6.
MISTAKE: Not knowing what to do with zero, for example, thinking there is no number before 0. | CORRECTION: The number before 0 is -1. Numbers continue into negative values.
Practice Questions
Try It Yourself
QUESTION: What is the number before 25? | ANSWER: 24
QUESTION: Your train arrives at Platform 7. Which platform comes just before Platform 7? | ANSWER: Platform 6
QUESTION: A mobile game level is 100. If you complete one level, what was the level number just before you started playing Level 100? | ANSWER: Level 99
MCQ
Quick Quiz
Which of these numbers comes immediately before 42?
43
41
52
32
The Correct Answer Is:
B
To find the number before 42, you subtract 1 from 42, which gives 41. Options A, C, and D are incorrect because they are either after 42 or much further away.
Real World Connection
In the Real World
When you check your mobile data usage, if you have 1 GB left and then use a small amount, the display might show '999 MB remaining'. The number before 1 GB (or 1000 MB) is 999 MB. This concept helps in tracking resources, like money in your UPI wallet or items in a shop's inventory.
Key Vocabulary
Key Terms
PREDECESSOR: The number that comes immediately before a given number | SUBTRACT: To take one number away from another | COUNTING: Saying numbers in order | NUMBER LINE: A visual representation of numbers in order
What's Next
What to Learn Next
Great job understanding 'number before'! Now you're ready to learn 'What is the Number After?', which involves adding 1. These foundational concepts are crucial for understanding larger mathematical operations and sequences.
