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Q1. A school collected 7,82,500 rupees for a charity event. What is the place value of 8 in this number?
(a) 8,000
(b) 80,000
(c) 8,00,000
(d) 80
Ans: (b) 80,000
8 is in the Ten Thousand (TTh) place.
Q2. A shop sold 12,75,000 chocolates in a year. How many crores is this equal to?
(a) 1 crore
(b) 12 crores
(c) 1.275 crores
(d) 0.1275 crores
Ans: (c) 1.275 crores
1 crore = 1,00,00,000. Divide 12,75,000 by 1,00,00,000: 12,75,000 ÷ 1,00,00,000 = 1.275 crores.
Q3. The population of a town increased from 9,87,654 to 10,01,234. Which number is greater?
(a) 9,87,654
(b) 10,01,234
(c) Both are equal
(d) Cannot be determined
Ans: (b) 10,01,234
Compare the digits: 9,87,654 has 6 digits, while 10,01,234 has 7 digits. A number with more digits is greater, so 10,01,234 > 9,87,654.
Q4. A store has 8,92,31,405 candies. How many more candies are needed to reach 9,00,00,000?
(a) 7,68,595
(b) 76,85,950
(c) 7,68,950
(d) 76,850
Ans: (a) 7,68,595
Q5. A school has 12,50,000 books in its library. How many lakhs is this equal to?
(a) 1.25 lakhs
(b) 12.5 lakhs
(c) 125 lakhs
(d) 0.125 lakhs
Ans: (b) 12.5 lakhs
1 lakh = 1,00,000. Divide 12,50,000 by 1,00,000: 12,50,000 ÷ 1,00,000 = 12.5 lakhs.
Q6. A movie ticket costs 250 rupees, and 4,00,000 people watched it. How much money was collected?
(a) 10,00,00,000 rupees
(b) 1,00,00,000 rupees
(c) 10,00,000 rupees
(d) 1,00,000 rupees
Ans: (b) 1,00,00,000 rupees
Total money = 250 × 4,00,000 = 1,00,00,000 rupees (250 × 400,000 = 100,000,000, or 1 crore).
Q7. A city’s population is 87,65,432. A nearby town has 87,56,432 people. Which population is larger?
(a) 87,65,432
(b) 87,56,432
(c) Both are equal
(d) Cannot be determined
Ans: (a) 87,65,432
Compare digits from the left. At the ten thousands place, 6 (in 87,65,432) > 5 (in 87,56,432), so 87,65,432 is larger.
Q8. A zoo collected 5,00,00,000 rupees in a year. How is this amount written in the International system?
(a) 50,000,000
(b) 500,000,000
(c) 5,000,000
(d) 500,000
Ans: (b) 500,000,000
5,00,00,000 is 5 crores. In the International system, it’s written as 500,000,000 (500 million), since 1 crore = 10 million and 5 crores = 50 million, but the full numeral matches 500,000,000.
Q9. A park has 2,34,56,789 visitors in a year. What is the number name for this in the Indian system?
(a) Two crore thirty-four lakh fifty-six thousand seven hundred eighty-nine
(b) Twenty-three crore forty-five lakh sixty-seven thousand eighty-nine
(c) Two lakh thirty-four thousand five hundred sixty-seven
(d) Two crore three lakh forty-five thousand six hundred eighty-nine
Ans: (a) Two crore thirty-four lakh fifty-six thousand seven hundred eighty-nine
2,34,56,789 = 2 (crores), 34 (lakhs), 56 (thousands), 7 (hundreds), 8 (tens), 9 (ones). So, it’s "two crore thirty-four lakh fifty-six thousand seven hundred eighty-nine."
Q10. A factory makes 7,89,123 toys. What is the smallest 6-digit number possible using these digits (each digit used only once)?
(a) 123789
(b) 132789
(c) 178923
(d) 123978
Ans: (a) 123789
Using digits 7, 8, 9, 1, 2, 3 once, arrange in ascending order: 1, 2, 3, 7, 8, 9 = 123789.
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FAQs on Number Sense - Math Olympiad for Class 5
| 1. What is Number Sense and why is it important for 5th graders? |  |
| 2. How can I improve my child's Number Sense skills at home? | |
Ans. You can improve your child's Number Sense skills by engaging them in everyday math activities. Encourage them to use math in cooking (measuring ingredients), shopping (calculating totals), and playing games that involve numbers. Additionally, provide them with puzzles and math-related games that challenge their thinking and problem-solving abilities.
| 3. What types of questions can we expect on a Number Sense exam for 5th grade? | |
Ans. A Number Sense exam for 5th grade typically includes questions that assess addition, subtraction, multiplication, and division skills. You might also find questions related to fractions, decimals, and word problems that require critical thinking. Some exams may include real-world scenarios to apply these concepts.
| 4. Are there any specific strategies to solve Number Sense problems effectively? | |
Ans. Yes, some effective strategies include breaking down complex problems into smaller, manageable parts, using visual aids like number lines or arrays, and practicing estimation to check the reasonableness of answers. Encouraging your child to explain their thought process can also enhance their understanding and problem-solving skills.
| 5. What resources are available for students to practice Number Sense? | |
Ans. There are numerous resources available for practicing Number Sense, including online math games, educational apps, and worksheets. Websites like Khan Academy and IXL provide interactive lessons and practice problems. Additionally, local libraries often have math workbooks and resources that can help reinforce these skills.
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