9. Negative Number
• -1, -2, -3, -4 every number which
is less than 1 is called negative
numbers
10. Writing integers
Example Written as Read as
1) (+55) + (-30) 55+ (-30) Fifty –five plus
negative thirty
2) (+49) + (+14) 49+(14) Forty-nine plus
Or 49+14 fourteen
3)(-27) + (-127) (-27) +(-127) Negative
twenty-seven
plus negative
hundred and
twenty-seven
11. Multiplication and division of
integers
• Ex. (1) (-14) X (-5)
The magnitudes of -14 and -5 are 14 and 5
respectively
Their product, 14X5 = 70
(-14) X(-5)=70
The product of two negative numbers is
positive.
12. Carry out the following
multiplications:
• 12X(-3)
• (-6) X4
• (-15)X(-5)
• 35X8
• (-38)X(-2)
• 15X(-61)
13. Carry out the following Divisions:
• (-15) / (-5)
• (-38/ (-2)
• 90/6
• (-90)/(-6)
14. PerCENTAGE
You may have come across with news items like
the Newspaper , Radio or T.V.
We use the word percent often in everyday affairs
For ex.
1)There has been 15per increase in food grain
production.
2)The cost of petrol has rises by 5percent.
Let us find out the meaning of these words and
learn how they are used.
20. • Given:
• Cost price=Rs 60
• discount=25%
• Amount of discount =25% of (60)
= 25 x 60
100
Ans =15.Rs
Price After Discount:-
=Cost price –discount amount
=60 – 15
=Rs 45.Rs
Total cost of shoes is 45 Rs.
21. • Given:
• cost price= Rs 30
• Tax=7%
• Amount of tax=7% of (30)
= 7 x 30
100
Ans =2.10 Rs.
Price after discount=cost price-discount amt
=30 + 2.10
Ans=32.10 Rs.
Total cost of shirt is 32.10 Rs.
23. PERCENTAGE OF A GIVEN
NUMBER
Convert the following fraction into percentage.
Find out a given percentage of a given numbers.
Example :-
1)50% of 70 means 70x50/100 = 35
2)3% of 25000 mean 25000x3/100 = 750
3) There are 40 percent girls in a certain school . If the
number of children in the school is 950, what is the number of
girls in the school.
40% of 950 = 950x40/100 = 380
Ans - Number of girls is 380
24. FIND PERCENTAGE
Find out what percentage of a given number forms of
another number.
24,50
24/50=
24x2/50x2 = 48/100 = 48%
2) 222 , 300
222/300 = 222÷3/300÷3 = 74/100 = 74%
25.
26. E.g. :
= 25 x [ 113 – 9 + 2 x 13 ]
= 25 x [ 113 – 9 + 26 ]
= 25 x [ 104 + 26 ]
= 25 x 130
= 3250
Solve the following ?
1. (130 + 91) x ( 2 + 8 ) = ? Ans. 2210
2. 103 + 91 x 2 + 8 = ? Ans. 293
27. The End
Bibliography : Mathematics Text book
(Standard Six )
www.wikipedia.co.in
www.slideshare.com
http://cgl.microsoft.com/
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