A Story of Numbers — Practice

Question 1

Which of the following is the correct Roman numeral for 2999?

Accepted Answer

MMCMXCIX

Question 2

The landmark numbers of a base-7 number system are:

Accepted Answer

1, 7, 49, 343, …

Question 3

Which number system had 1, 20 and 360 as its landmark numbers?

Accepted Answer

Mayan

Question 4

In the Egyptian number system, why can no symbol ever appear 10 or more times in a correctly written numeral?

Accepted Answer

Because ten of any landmark make the next landmark, so they are exchanged for one symbol of the next size

Question 5

The base-10 number 25 written as a base-5 numeral is:

Accepted Answer

100

Question 6

Who codified the arithmetic of zero as a number in its own right, in 628 CE?

Accepted Answer

Brahmagupta

Question 7

Write 715 in Roman numerals.

Accepted Answer

DCCXV

Question 8

In the base-5 system built in the chapter, how is 651 grouped into landmark numbers?

Accepted Answer

625 + 25 + 1

Practice — A Story of Numbers