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“Ss introduction tc
:. £& pra 7
Warm-up ™&" —
Amaya and her mother go to the nearby market to buy some items. *
1, Amaya has a basket of 50 cherries. Her mother gives her 30 more cherries. 7
_ How many cherries does Ananya have itt total? .......0000 a
2. She buys five chocolates. She will give two chocolates to her friends. 7
How many chocolates will be left with her? .......00s06 ; ie
_ 3. Her mother buys 5 pens each costing % 15. iY «BA
The total cost of § pens is... Lae Bg ff
4, Amaya buys 130 sheets of paper for her brother’s project. —— S WS
Her brother has to make $ books with 130 sheets. 14 ‘
How many sheets of paper will each book have? \ V
| , mee Learning Objectives
. In this chapter, you will learn abo id re
0 aaa | © Variables and constants os
: Ax ahs 3 || ¢ Variables in rules
© 3¢=¢ q || ¢ Algebraic expressions ia
a Ya) , [| * Using expressions practically a
, = ; Bre —_ — ~
t “i a
— £ _swonder, why are Yeah, it is | ke
ff weusing letters secret code to fine
4 __ instead of numbers | i s ae numbdels.
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ee Rit
ao ta
3

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m an auditorium, seats are arranged in such a way that the first row kontanis 5 ahh the
ond row has 10 seats, the third row has 15 seats and so on, Amaya is sitting in the
Oth row. How can we find the number of seats in the row where Amaya is seated?
(in algebra, letters (such asx, y, 2,4,
 b...) representing the value of a
| number are known as ‘literals’ or
= can find the answer by making a table.
m you analyse the table? 5
‘The number of seats in the 10th foW iS verses A symbol which can
Do you find any pattern in the number of seats? ,. 5 git ong
Pon you Ala nist (ean called a variable. A symbol
amemnch en 810 AEH WY ~ which has a fixed numerical
uy~sing the table, we find a relationship between the rows and value is called a constant.
Tauimber of seats. ae AR ae :
Rt is, the number of seats is five times the row number, |
&S write the letter

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