What is Hiding?

S0-SA2-0302

Grade Level:

Pre-School – Class 2

All domains without exception

Definition

What is it?

What is Hiding? refers to finding a missing part in a number sentence or a pattern. It's like a small puzzle where one number or item is secret, and you need to figure out what it is to complete the picture.

Simple Example

Quick Example

Imagine your school bus has 20 seats. If you see 15 students already sitting, how many seats are 'hiding' or empty? You know the total (20) and one part (15), so you need to find the other part (the empty seats).

Worked Example

Step-by-Step

PROBLEM: My mother bought 12 laddoos for a party. If 7 laddoos were eaten, how many laddoos are left (hiding)?
---STEP 1: Understand the total. The total number of laddoos is 12.
---STEP 2: Identify the known part. The number of laddoos eaten is 7.
---STEP 3: Realize what is hiding. We need to find the number of laddoos remaining.
---STEP 4: Choose the correct operation. To find the remaining part, we subtract the known part from the total.
---STEP 5: Perform the calculation. 12 - 7 = 5.
---ANSWER: There are 5 laddoos left (hiding).

Why It Matters

Understanding 'What is Hiding?' helps you solve problems in math and daily life, from managing your pocket money to understanding science experiments. It's a basic skill used by engineers to design bridges, by doctors to calculate medicine doses, and by scientists to predict weather.

Common Mistakes

MISTAKE: Adding the known parts instead of subtracting when finding a missing part in a 'total' situation. | CORRECTION: Always think if you are looking for a 'total' or a 'part'. If you know the total and one part, you subtract to find the other part.

MISTAKE: Not reading the question carefully and mixing up the 'total' with a 'part'. | CORRECTION: Identify what the question is giving you (total, or a part) and what it is asking you to find (the 'hiding' part).

MISTAKE: Guessing the answer without doing any calculation. | CORRECTION: Always try to use a simple operation like addition or subtraction to logically find the missing number, rather than just guessing.

Practice Questions

Try It Yourself

QUESTION: A cricket team scored 150 runs. If 90 runs came from boundaries (fours and sixes), how many runs came from singles and doubles (hiding)? | ANSWER: 60 runs

QUESTION: My father has 500 rupees. He spent some money on chai and snacks. If 350 rupees are left, how much money did he spend (hiding)? | ANSWER: 150 rupees

QUESTION: In a school bus, there are 35 students. At the first stop, 10 students got off. At the second stop, some more students got off. Now there are 18 students left. How many students got off at the second stop (hiding)? | ANSWER: 7 students

MCQ

Quick Quiz

Rohan had 25 marbles. He gave some to his friend. Now he has 18 marbles left. How many marbles did he give away (hiding)?

The Correct Answer Is:

Rohan started with 25 marbles (total) and ended with 18 (one part). To find the marbles he gave away (the hiding part), we subtract: 25 - 18 = 7.

Real World Connection

In the Real World

When you use a mobile data pack, you start with a total amount (e.g., 2 GB). As you browse social media or watch videos, some data is used. Your phone shows you 'data remaining'. The 'data used' is what was hiding, calculated by subtracting remaining data from the total.

Key Vocabulary

Key Terms

MISSING: Not present or not found | PART: A section or piece of a whole | TOTAL: The whole amount or number | SUBTRACTION: Taking one number away from another | PATTERN: A regular arrangement or sequence

What's Next

What to Learn Next

Next, you can learn about 'Number Bonds' and 'Fact Families'. These concepts build on finding what is hiding by showing how numbers are related through addition and subtraction, helping you solve even bigger puzzles!