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Playing with Numbers Class 8 PPT

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? The general form of a two digit number is 
tens digit x 10 + ones digit
? Example : 43
=4x10 + 3
? 59 
=5x10 + 9   
? 63     
= 6x10+3
Page 2


? The general form of a two digit number is 
tens digit x 10 + ones digit
? Example : 43
=4x10 + 3
? 59 
=5x10 + 9   
? 63     
= 6x10+3
? The general form of a 3-digit number is 
hundreds digit x 100 + tens digit x 10 + 
ones digit.
? Example 
? 125 = 1x100 + 2 x10 + 5
? 234= 2 x 100 + 3 x 10 +4
? 554= 5 x 100 + 5 x 10 + 4
Page 3


? The general form of a two digit number is 
tens digit x 10 + ones digit
? Example : 43
=4x10 + 3
? 59 
=5x10 + 9   
? 63     
= 6x10+3
? The general form of a 3-digit number is 
hundreds digit x 100 + tens digit x 10 + 
ones digit.
? Example 
? 125 = 1x100 + 2 x10 + 5
? 234= 2 x 100 + 3 x 10 +4
? 554= 5 x 100 + 5 x 10 + 4
? The general form of a 4-digit number is 
thousands digit x 1000+ hundreds digit x 
100 + tens digit x 10 + ones digit.
Example
? 4521= 4x1000+5x100+2x10+1
? 9845= 9x1000+8x100+4x10+5
Page 4


? The general form of a two digit number is 
tens digit x 10 + ones digit
? Example : 43
=4x10 + 3
? 59 
=5x10 + 9   
? 63     
= 6x10+3
? The general form of a 3-digit number is 
hundreds digit x 100 + tens digit x 10 + 
ones digit.
? Example 
? 125 = 1x100 + 2 x10 + 5
? 234= 2 x 100 + 3 x 10 +4
? 554= 5 x 100 + 5 x 10 + 4
? The general form of a 4-digit number is 
thousands digit x 1000+ hundreds digit x 
100 + tens digit x 10 + ones digit.
Example
? 4521= 4x1000+5x100+2x10+1
? 9845= 9x1000+8x100+4x10+5
? For examples
a+3=7   hare a is 4
a4=20 hare a is  5
Page 5


? The general form of a two digit number is 
tens digit x 10 + ones digit
? Example : 43
=4x10 + 3
? 59 
=5x10 + 9   
? 63     
= 6x10+3
? The general form of a 3-digit number is 
hundreds digit x 100 + tens digit x 10 + 
ones digit.
? Example 
? 125 = 1x100 + 2 x10 + 5
? 234= 2 x 100 + 3 x 10 +4
? 554= 5 x 100 + 5 x 10 + 4
? The general form of a 4-digit number is 
thousands digit x 1000+ hundreds digit x 
100 + tens digit x 10 + ones digit.
Example
? 4521= 4x1000+5x100+2x10+1
? 9845= 9x1000+8x100+4x10+5
? For examples
a+3=7   hare a is 4
a4=20 hare a is  5
8    b   2
+ 5   5    a
1  c   7   3
Find the value of 
a
b 
c
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