Page 9 - Start Up Mathematics_6
P. 9
1 Knowing Our Numbers
The principal of a school Ms Ritu wants to select a student as a head boy or head girl. To be fair
to all students she takes the opinion of all the teachers and shortlists 3 students out of which one
has to be selected. In order to involve the students in the decision-making, Ms Ritu decides to have
elections in which all the student will vote. The student who gets the maximum numbers of votes
will be the head boy or head girl. In such a situation or when a country goes in for an election to
elect the new government, we need to know how to handle large numbers.
In this chapter, besides Indian and International system of numeration we will learn how to
compare large numbers, various units of measurement, relation between different units, estimation
of numbers and Roman numerals.
Natural Numbers
The counting numbers 1, 2, 3, 4, … are called natural numbers.
Whole Numbers
The natural numbers along with 0 are called whole numbers.
Digits
In Hindu-Arabic system of writing numbers, the ten symbols namely 0, 1, 2, 3, 4, 5, 6, 7, 8 and
9 are called digits or figures.
Numeral
A single digit or group of digits denoting a number is called a numeral. For example, 8; 3451
and 71563 are numerals.
The process of writing a number in digits or figures is called notation.
Numeration
Writing a number in words is called numeration.
Number Patterns
Numbers can have some interesting patterns. Complete the table 9 + 1 = 10
given alongside to find out for yourself. 99 + 1 = 100
999 + 1 = .............
9,999 + 1 = .............
99,999 + 1 = .............
