What one lakh really is
Easy to say, hard to picture
One lakh is written 1,00,000. It is a 1 followed by five zeros.
📚 Chapter Learning Kit
Large Numbers Around Us · Class 7 Mathematics · Ganita Prakash
English 3 topics 105 leveled MCQs 51 flashcards 5 games Free
Shared by a Veda teacher · Generated with Veda AI · Oct 2026
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How a lakh is reached
The smallest six-digit number
The largest 5-digit number is 99,999. Add one and you get 1,00,000.
Where the commas go
Three, then two, then two
In the Indian system a lakh is written 1,00,000 and not 100,000.
Two ways to group a long number
Same digits, different commas
A long number can be written two ways, and both are correct.
The Indian grouping
Three, then two, then two
Start from the right. Mark off three digits, then group in twos.
The International grouping
Threes all the way
Start from the right and keep grouping in threes.
📖 Smart notes
What you'll study, topic by topic
1
How big is one lakh?
One lakh is 1,00,000. It is the smallest six-digit number, reached by adding 1 to 99,999. The same amount is also 10,000 tens, 1,000 hundreds or 100 thousands. Dividing it by a familiar unit turns it from a word into a s…
- One lakh is written 1,00,000 and is the smallest six-digit number.
- Adding 1 to 99,999 opens a sixth place and gives a lakh.
- Indian commas group three digits from the right, then two at a time.
~35 min · full explanation, examples & memory tricks in the app
2
Crores, and two ways to group the digits
The Indian system marks off three digits then groups in twos, giving 1,00,00,000 for a crore. The International system groups in threes, giving 10,000,000. The digits never change. One crore is ten million, and one milli…
- The Indian system marks off three digits from the right, then groups in twos.
- The International system groups in threes all the way from the right.
- One crore is 1,00,00,000 in the Indian system and 10,000,000 abroad.
~40 min · full explanation, examples & memory tricks in the app
3
Exact or approximate, and the size of a product
Some numbers must be exact and others need only be close, and the use decides which. It also decides the direction: round up when falling short costs more, down when overstating does. Rounding to a smaller unit throws le…
- Prices and marks must be exact; populations and crowds need not be.
- A round figure shows the SIZE, which an exact one can hide.
- Round up when falling short costs more, as with meals for 847 guests.
~45 min · full explanation, examples & memory tricks in the app
❓ Leveled MCQ practice
Try the smart MCQs from this kit
105 questions laddered from warm-up to topper-level, each with an explanation. A taste:
The largest 5-digit number is 99,999. Adding 1 to it gives
Beginner
A 99,000
B 1,00,000
C 10,000
D 9,99,999
Show answer & explanation
1,00,000
Adding 1 rolls every digit over to zero and opens a sixth place.
How many times must a key that adds 1000 be pressed to reach one lakh?
Beginner
A 1,000
B 100
C 10,000
D 10
Show answer & explanation
100
1000 multiplied by 100 is 1,00,000.
How many times must a key that adds 10 be pressed to reach one lakh?
Beginner
A 1,000
B 100
C 10,000
D 1,00,000
Show answer & explanation
10,000
10 multiplied by 10,000 is 1,00,000.
Why does a key that adds more need fewer presses to reach a lakh?
Intermediate
A the total grows when the key is bigger
B a bigger key skips some of the numbers along the way to the lakh
C the total shrinks when the key is bigger
D the total is fixed, so a bigger step covers it in fewer steps
Show answer & explanation
the total is fixed, so a bigger step covers it in fewer steps
A lakh is fixed. Presses and step size trade off, and their product stays 1,00,000.
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