Embibe Experts Solutions for Chapter: Knowing Our Numbers, Exercise 1: Exercise

$52$ students each from $190$ schools participated in a cultural competition. 

Which of the following is the closest to the number of students who participated in the event?

Lakshmi is multiplying two numbers, $8950\times 205$ and she needs the exact value. Given below is her work.

$\left(1\right)$ $9000\times 200=1800000$

$\left(2\right)$ $(9000-8950)\times (205-200)=50\times 5=250$

$\left(3\right)$ $1800000-250=1799750$

 Which of the following numbers must be added to her answer in the third step to get the exact value of the product?

John is trying to find out the number of millions in the number, $189345678$.

How many millions are there in the number?

Padma has some labels with numbers written on them. She arranged them in ascending order.

The numbers are, $34789, 8463, 124552, 34879, 8436, 124525, 8643$.

Which number come in the middle?

Nidhi formed a five-digit number, $\left[\mathrm{A}\right]\left[\mathrm{B}\right]\left[\mathrm{C}\right]\left[\mathrm{D}\right]\left[\mathrm{E}\right]$, where each alphabet represents a distinct digit from $0$ to $9$. The digits she had assigned to $\mathrm{C}$ and $\mathrm{E}$  were $7$ and $2$ respectively. 

She swapped the digits $\mathrm{C}$ and $\mathrm{E}$ and got a new number.  Then she subtracted the new number from the old number.

Which of the following is the answer will she get?

Two friends were playing a game in which they set to form a four-digit number using flashcards. They had five flashcards with one digit from the set of $0, 7, 3, 2, 5$ written on them.  They fixed $7$ at the hundredth place and formed different numbers.

What is the smallest number they could have formed? 

Ramesh bought a piece of land for $₹12,17,423$. He bought another piece of land which was $₹2,38,547$less than the price of the land he purchased first.

How much money did he pay altogether for both the lands?

A specific house in one of the cities in USA costs $\$431,800$. If one dollar is equivalent to$₹80$, then which of the following will be its price in rupees?