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What is the Same Size?
Grade Level:
Pre-School – Class 2
All domains without exception
Definition
What is it?
When two or more things are the 'same size', it means they have the exact same measurements in terms of length, width, height, or overall volume. They fit perfectly into each other or take up the same amount of space.
Simple Example
Quick Example
Imagine you have two cricket balls. If both balls are exactly the same size, they will both fit into the same size glove perfectly, and they will both weigh the same if made of the same material. They are identical in their dimensions.
Worked Example
Step-by-Step
Let's say your mother wants to buy two tiffin boxes for you and your sibling, and she wants them to be the same size so they fit in your school bags easily.
---Step 1: She finds a tiffin box that is 15 cm long, 10 cm wide, and 5 cm high.
---Step 2: She needs to find another tiffin box with the exact same dimensions.
---Step 3: She looks at another tiffin box and checks its length, width, and height.
---Step 4: If the second tiffin box is also 15 cm long, 10 cm wide, and 5 cm high, then both tiffin boxes are the same size.
---Answer: Yes, if both tiffin boxes have dimensions 15 cm x 10 cm x 5 cm, they are the same size.
Why It Matters
Understanding 'same size' is basic to many fields like engineering, architecture, and even cooking. Engineers need parts of the same size to build machines, and chefs need same-size ingredients for consistent recipes. It's crucial for precision and accuracy in construction and manufacturing.
Common Mistakes
MISTAKE: Thinking two objects are the same size just because they look similar. | CORRECTION: Always check the actual measurements (length, width, height) to confirm if they are truly the same size.
MISTAKE: Confusing 'same size' with 'same shape'. | CORRECTION: Objects can be the same shape (like two circles) but different sizes (one small, one large). For them to be the same size, all dimensions must match.
MISTAKE: Assuming two things are the same size if one fits inside the other loosely. | CORRECTION: For things to be the same size, they must fit perfectly without extra space, or occupy the exact same space if placed side-by-side.
Practice Questions
Try It Yourself
QUESTION: Your friend has a pencil that is 18 cm long. You want to buy a pencil of the same size. How long should your pencil be? | ANSWER: Your pencil should also be 18 cm long.
QUESTION: A small ladoo has a diameter of 3 cm. If you make another ladoo that is the same size, what will its diameter be? | ANSWER: Its diameter will also be 3 cm.
QUESTION: A mobile phone cover is designed for a phone that is 16 cm long, 7 cm wide, and 0.8 cm thick. If you buy a new phone and want to use the same cover, what must be the exact dimensions of your new phone? | ANSWER: Your new phone must be 16 cm long, 7 cm wide, and 0.8 cm thick.
MCQ
Quick Quiz
Which of these pairs represents objects of the 'same size'?
A big mango and a small mango
Two identical 5-rupee coins
A football and a tennis ball
Your school bag and your friend's school bag (which is much bigger)
The Correct Answer Is:
B
Two identical 5-rupee coins are manufactured to have the exact same diameter and thickness, making them the same size. The other options describe objects of different sizes.
Real World Connection
In the Real World
When you buy spare parts for your bicycle or motorbike, like a new tyre or a specific screw, they must be the 'same size' as the original part for them to fit and work correctly. Similarly, in factories producing items like biscuits or mobile phones, every piece is made to be the same size using precise machines to ensure quality and consistency.
Key Vocabulary
Key Terms
DIMENSIONS: measurements like length, width, height | IDENTICAL: exactly alike, no differences | MEASUREMENTS: the size or amount of something | CONSISTENT: always happening in the same way
What's Next
What to Learn Next
Now that you understand 'same size', you can move on to 'What is Different Size?'. This will help you compare objects and understand how their measurements can vary, building on your current knowledge.
