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CBSE Questions for Class 6 Maths Knowing Our Numbers Quiz 8 - MCQExams.com
CBSE
Class 6 Maths
Knowing Our Numbers
Quiz 8
Which of the following numbers in Roman numerals is incorrect?
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$$LXXX$$
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$$LXX$$
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$$LX$$
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$$LLX$$
Explanation
According to the rules of writing Roman numerals, L can be used only once.
So LLX is not a correct representation of roman numeral
$$\therefore\ \textbf{Option D is correct}$$
When rounded off to nearest thousands, the number $$85642$$ is
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$$85600$$
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$$85700$$
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$$85000$$
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$$86000$$
Explanation
$$\textbf{Check the digit in the hundreds place:}$$
As we are rounding off the number to the nearest thousands we need to check the digit in the next smaller place value which is hundreds place.
Given number $$= 85642$$
At hundreds places we have $$6$$ which is greater than $$5$$, so we add $$1$$ to the thousand’s place.
Therefore new thousands place will be $$5 + 1 = 6$$
Other digits on the right of the thousand's place will be zeros.
$$\therefore\ 85642$$ rounded off to nearest thousand’s place $$= 86,000$$
$$\therefore$$ $$\textbf{Correct Option is D}$$
The greatest number which on rounding off to nearest thousands gives $$5000$$, is
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$$5001$$
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$$5559$$
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$$5999$$
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$$5499$$
Explanation
$$\textbf{Identifying the digit in the hundreds place:}$$
As we are rounding off the number to the nearest thousands we need to check the digit in the next smaller place value which is hundreds place.
Given that a number is rounded off to get $$5000$$.
All the numbers given in the options have $$5$$ in the thousands place.
So the digit in the hundreds place should be less than $$5$$.
Also we need the greatest possible number so we should take the biggest digit that is less than $$5$$ which is $$4$$.
So the hundreds place should have $$4$$,
The remaining places should have the highest digit which is $$9$$.
So, $$5499$$ is the required number.
$$\therefore$$ $$\textbf{Option D is correct}$$.
One million is equal to
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$$1$$ lakh
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$$10$$ lakh
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$$1$$ crore
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$$10$$ crore
Explanation
We know that $$1$$ million $$= 1,000,000$$
$$= 10,00,000$$ in Indian system
And $$1$$ lakh $$= 1,00,000$$
Now $$1$$ million $$ = 1,000,000$$
$$=10, 00,000$$
$$= 10 \times 1,00,000$$
$$= 10$$ lakhs
Therefore, $$1$$ million $$= \underline{10}$$ lakhs
$$\therefore$$ $$\textbf{Option B is correct}$$.
Keeping the place of $$6$$ in the number $$6350947$$ same, the smallest number obtained by rearranging other digits is
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$$6975430$$
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$$6043579$$
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$$6034579$$
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$$6034759$$
Explanation
$$\textbf{Step 1: Arrange the digits other than $$6$$ in ascending order to get the smallest possible number}$$
Given, number $$6350947$$ has $$7$$ digits and $$6$$ needs to be in its original place.
Remaining digits $$3, 5, 0, 9, 4, 7$$ are to be rearranged to get a smallest number.
So the number starts with $$6$$ and and the remaining digits should follow in ascending order.
Ascending order of digits $$3, 5, 0, 9, 4, 7$$ is $$0 < 3 < 4 < 5 < 7 < 9$$
So, the smallest number that can be formed $$\underline{6034579}$$
$$\therefore$$ $$\textbf{Option C is correct}$$.
The largest $$5$$- digit number having three different digits is
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$$98978$$
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$$99897$$
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$$99987$$
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$$98799$$
Explanation
$$\textbf{Step1: Identify the digits}$$
We have to form largest $$5$$-digit number using three different digits
So we will use largest numbers $$9, 8,$$ and $$7$$
To form a $$5$$-digit number, we have to use one or two digits more than once.
$$\textbf{Step2: Arrange the digits in descending order}$$
We will use digit $$9$$ three times, as it is the largest of the digits.
We will write the remaining two digits in descending order to form the largest number.
So,
largest $$5$$-digit number formed with three different digits $$9, 8, 7$$ is $$99987$$
$$\therefore$$ $$\textbf{Option C is correct}$$.
The sum of two whole numbers is always less than their product.
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True
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False
Explanation
Let us assume two whole numbers $$0$$ and $$1$$ then:
Their sum is $$0 + 1 = 1$$
And their product is $$0 \times 1 = 0$$
Clearly, their sum is greater than the product.
$$\textbf{Therefore the given statement is False}.$$
The smallest $$4-$$ digit number having three different digits is
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$$1102$$
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$$1012$$
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$$1020$$
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$$1002$$
Explanation
$$\textbf{Step 1: Identify the digits}$$
We have to find the smallest $$4$$-digit number having three different digits.
So, we will use the smallest digits $$0, 1, 2$$
Any of the digits $$0, 1, 2$$ is to be repeated two times to form a $$4$$-digit number.
$$0$$ is the smallest number among $$0, 1, 2$$ and can be used twice.
$$\textbf{Step 2: Arrange the digits in ascending order}$$
$$0$$ cannot be placed in the thousand's place as a number cannot start with $$0$$.
So, place the next smallest number $$1$$ in the thousands place.
Therefore Smallest $$4$$-digit number formed with three different digits $$0, 1, 2$$ is $$1002$$
$$\therefore$$ $$\textbf{Option D is correct}$$.
If a grown up elephant eats 136 kg in a day, then how much will elephant eat in a year? (No Leap year)
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49542
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49640
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48795
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49998
Which of the following is the correct representation for the following statement?
"4 is subtracted from 13 and resulting answer multiplied by the sum of 8 and 15".
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$$13 - 4 + 8 + 15$$
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$$(13 - 4) 8 + 15$$
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$$(13 - 4) + (8 + 15)$$
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$$(13 - 4) (8 + 15)$$
Which of the following expression represents the sum of five and nine is multiplied by three?
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$$ 5 + 9 3$$
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$$ 5 + (9 3)$$
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$$ (5 + 9) 3$$
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None of these
Explanation
Sum of five and nine is represented as $$5+9$$
Three multiplied by the sum of five and nine is represented as $$3 \times (5+9)$$ or $$3(5+9)$$
The traffic lights at three different road
crossings change after every 48 sec, 72 sec and 108 sec, respectively. If they
all change simultaneously at 8:20:00 hrs., then at what time will they again
change simultaneously?
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8:26:12 hrs.
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8:26:00 hrs.
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8:27:00 hrs.
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8:27:12 hrs.
Write the greatest $$4-digit$$ number using different digits with $$6$$ in the ten's place?
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$$9865$$
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$$9867$$
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$$9687$$
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$$6987$$
Expanded form of $$37034$$ is __________.
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$$3000 + 700 + 0 + 30 + 4$$
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$$30000 + 700 + 0 + 10 + 4$$
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$$30000 + 1000 + 0 + 70 + 4$$
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$$30000 + 7000 + 0 + 30 + 4$$
Find the greatest number which will divide the greatest $$4-digit$$ number and the greatest $$5-digit$$ number exactly.
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$$9$$
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$$8$$
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$$7$$
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$$3$$
One trillion is 1 followed by 12 zeros. What is 1 followed by 18 zeros?
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1 quadrillion
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1 quintillion
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1 septillion
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1 octillion
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