1. How many zeros are there in 1 lakh?
- A4
- B5
- C6
- D7
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Answer: B) 5
1 lakh = 1,00,000 which has 5 zeros.
Class 7 Expressing Large Numbers — practice questions with answers
Number System · 5 sample questions from the school syllabus. Try each one, then open the answer and the worked solution.
2. Which is the largest 8-digit number?
- A99999999
- B10000000
- C99999990
- D100000000
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Answer: A) 99999999
The largest 8-digit number is 9,99,99,999 = 99999999.
3. Express 7,20,00,000 in expanded form using powers of 10.
- A7 x 10⁷ + 2 x 10⁶
- B7 x 10⁶ + 2 x 10⁵
- C72 x 10⁶
- D7 x 10⁷ + 2 x 10⁷
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Answer: A) 7 x 10⁷ + 2 x 10⁶
7,20,00,000 = 72000000 = 7 crore + 2 ten-lakh = 7 x 10⁷ + 2 x 10⁶.
4. Three friends note their families' yearly savings: Rs 2,45,000, Rs 24,50,000 and Rs 2,04,500.
Arranged from largest to smallest, which is the largest?
Arranged from largest to smallest, which is the largest?
- ARs 24,50,000
- BRs 2,45,000
- CRs 2,04,500
- DAll equal
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Answer: A) Rs 24,50,000
Counting digits: 24,50,000 has 7 digits while the others have 6, so 24,50,000 is the largest.
5. A satellite TV company has 8 crore 40 lakh subscribers. A foreign partner records numbers in millions and rounds to the nearest 10 million.
To what value (in millions) is the subscriber count rounded?
To what value (in millions) is the subscriber count rounded?
- A80 million
- B90 million
- C84 million
- D8 million
Show answer
Answer: A) 80 million
8 crore 40 lakh = 8,40,00,000 = 84 million. Rounded to nearest 10 million: 84 is closer to 80 than 90, so 80 million.
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