NCERT Solutions for Chapter: Knowing Our Numbers, Exercise 1: Exercise

$M$ and $N$ are two numbers. The non-zero digit in the crore's place of $M$ is $4$ less than the digit in the thousands place of $N$. The non-zero digit in $10\text{'}s$ place of $N$ is $3$ less than the number in hundred's place of $M$. If both the numbers have equal number of digits and all the remaining digits are equal but not zeros. Find the least possible difference between $M$ and $N$.

Find the sum between the greatest $5$-digit number and the greatest $4$-digit number formed using the digits $7, 6, 2, 5, 1$  when the repetition is not allowed.

How many $4$-digit odd numbers can you make using the digits $5, 3, 8 \text{and} 0$ without repeating any digit?

The sum of twelve lakh seven thousand five hundred and eighty-three lakh sixteen thousand eight is:

$X$ is the smallest four-digit number formed by all the digits $0, 7, 8$, and $9$. $Y$ is the greatest four-digit number formed by all the digits $0, 7, 8$ and $9$. Find $Y-X$.

The difference between the greatest and the smallest numbers formed by all the digits $2, 3,5,$ and $7$ is $XYZX$ where $X, Y, Z$ are digits, then $X$ is ______.

Find the value:

$2400-400\times \left(280÷70\right)$

If $x, y$ and $z$ are digits, and 

$7x2-48yz73$

Then, find the value of $2x+3y+5z$.