P P Vermani, A K Bakshi and, Jyoti Bhatia Solutions for Chapter: Number System, Exercise 7: Let's do

In which system of numeration, there is no representation for zero? (Roman, Hindu-Arabic)

In which system of numeration, each period has $3$ place values?

How many lakhs are there in a crore?

Numbers starting from $1, 2, 3$ are called _____.(Odd number/Natural number/Even number)

Numbers that can be represented in groups of $2$ are called _____ numbers.

Roman numeral for $8$ is _____

Hindu-Arabic numeral for $\mathrm{XVI}$ is _____

$163$ is rounded off to the nearest ten as _____.