Olympiad Test: Knowing Our Numbers - Class 6 MCQ

The only even prime number is 2. This is because a prime number is defined as a number greater than 1 that has no positive divisors other than 1 and itself. While all other even numbers can be divided by 2, making them not prime, 2 can only be divided by 1 and 2, making it the only even prime number.

Explanation:

• Million: One million is equal to 1,000,000.
• Billion: One billion is equal to 1,000,000,000.

To find out how many millions are in a billion, we divide 1 billion by 1 million:

• 1,000,000,000 / 1,000,000 = 1000

Therefore, 1 billion is equal to 1000 million.

The estimated value of 467 to the nearest thousand is zero because when rounding to the nearest thousand, any number below 500 will be rounded down to zero. In this case, 467 is less than 500, so it gets rounded down to zero.

To solve this, let's first find the sum of 178 and 69:
178 + 69 = 247
Now, we round 247 to the nearest hundred.
The nearest hundred to 247 is 200 because 247 is closer to 200 than to 300.
So, the sum of 178 and 69 rounded to the nearest hundred is 200.

The correct answer is 1000 because there are 1000 thousands in one million.

In the International system of numeration, one crore is equal to ten million. This is because one crore is equal to ten million in the Indian numbering system, which is used in countries like India, Pakistan, and Bangladesh. In this system, one crore is equivalent to ten million, so the correct answer is 10.

The given question asks to find the smallest number among the given numbers. The numbers are 1411, 14504, 2431, 10001, and 9900. The smallest number among these numbers is 1411.

The question asks for the biggest 4-digit number that can be formed using the digits 5, 7, 8, and 9 without repetition. The given answer, 9875, is indeed the largest possible number that can be formed using these digits without repetition.

The Roman numeral "LXIX" represents the number 69. In Roman numerals, "L" stands for 50, "X" stands for 10, and "IX" stands for 9. Adding these values together gives us 50 + 10 + 9 = 69.

The smallest 5-digit number is 10000, and the largest 4-digit number is 9999.

To find the difference between them:

10000 − 9999 = 1

So, the smallest 5-digit number exceeds the largest 4-digit number by 1.

The correct answer is d) 1.

The correct answer is "Two hundred thirty-five thousand six" because it accurately represents the number 235,006 in words according to the international system of numeration. The number 235,006 is composed of 200,000 (two hundred thousand), 30,000 (thirty thousand), and 6 (six). In this system, there are no lakh units, so the options with "lakh" and "thousand" combined are incorrect.

solving equation

5 × (14 - 20).

5×(−6)

= (−30)

To find the approximate length of Sita's ribbon, we need to subtract 1232 mm from Rita's ribbon length and then round the result to the nearest hundred.
Rita's ribbon length = 2070 mm Sita's ribbon length = Rita's ribbon length - 1232 mm
Sita's ribbon length ≈ 2070 mm - 1232 mm Sita's ribbon length ≈ 838 mm
When rounded to the nearest hundred, Sita's ribbon length is approximately 800 mm.

During the finals, 10050 tickets were sold, whereas for the semi-final match, only 9872 tickets were sold. To find out how many more tickets were sold during the finals, we subtract the number of tickets sold for the semi-finals from the number of tickets sold during the finals. Therefore, 10050 - 9872 = 178. Since we need to estimate to the nearest tens, the answer would be 180.

To find the sum of 267 + 132 to the nearest ten, we first add the two numbers which gives us 399. Since 399 is closer to 400 than to any other multiple of ten, the sum rounded to the nearest ten is 400.

According to this rule, multiplication and division are performed before addition and subtraction. This ensures that calculations are done in a consistent and logical order.

In the expression 2×10000+6×1000 = 20000 + 6000 = 26000

To estimate the value of the product of 108 and 12, you can round the numbers to make the calculation easier:

• Round 108 to 110.
• Round 12 to 10.

Now, multiply:

110×10=1100

So, the estimated value is closest to 1000.

The Roman numeral for 400 is CD. In Roman numerals, C represents 100 and D represents 500. When a smaller numeral (C) is placed before a larger numeral (D), it indicates subtraction. So, CD represents 500-100=400.

To solve the equation, we can substitute the given values into the equation and solve for the missing value.
By substituting 100 for the missing value,
we get 15 x 1000 + 7 x 100 + 6 x 10 = 15760.
Simplifying the equation, we get 15000 + 700 + 60 = 15760.
Combining like terms, we get 15760 = 15760,
which is a true statement.
Therefore, the missing value must be 100.

To solve this, we need to first add 3537 and 3884, then round the result to the nearest tens.

1. Add the numbers:

   3537+3884=7421

2. Round 7421 to the nearest tens: The last digit is 1, so we round it down, resulting in 7420.

Now, let's compare the result with the given options: 1000, 7400, 7420, and 7440.

None of these options match exactly, but 7440 seems like a possible option if the problem has a small error in rounding or intended choices.

Thus, the closest matching option is 7420.