In 34879, 3 is in 10000's place, 4 is in 1000's place, 8 is in 100's place, 7 is in 10's place and 9 is in 1's place.
So, $34879=3\times 10000+4\times 1000+8\times 100+7\times 10+9\times 1$

According to Indian number system, correct way to write 50801592 is 5,08,01,592.

5873 - 436 =  5437
5437 is less than 5450, the mid point of 5400 and 5500. 
Hence, 5437 rounded off to the nearest hundreds is 5400.

Let us first convert the Roman numerals into Hindu-Arabic numerals.
When a Roman numeral with the larger value is on the left, we add the values together and when it is on the left, we subtract the values.
$\therefore$ XLVI = (50 - 10 ) + 5 + 1
             = 56 - 10
             = 46
LXX = 50 + 10 + 10
        = 70
$\therefore$ XLVI + LXX = 46 + 70 = 116
But, 116 = 100 + 16 = C + XVI = CXVI.
$\therefore$ XLVI + LXX = CXVI

Using the digits 6, 3 and 8 the smallest number that can be formed is 368 and the largest will be 863.

1 Lakh = 100000
1 Thousand = 1000
$\therefore 1Lakh=HundredThousand$

Place value of 6 at I = 6000
Place value of 6 at II = 60
$\Rightarrow \frac{\text{Place value of 6 at I}}{\text{Place value of 6 at II}}=\frac{6000}{60}$
= 100

In a set of natural numbers, the largest number cannot be determined.

Forty lakh seventy thousand and eight = 40,70,008.

Natural numbers start from number 1.