# Unit-2 The World of Numbers

This unit puts light on the invention of numbers, origin of these numbers and how old are they.

Solve the following :

i) 2 + (- 5)

ii) 3 - (- 2 )+ ( - 5)

iii) (- 7) X 4 X (- 3)

iv) 2 X 2 X (27 / 3) + (1 - 20)

v) ( (18 / 3) / ( (4 X 3) - 36) ) X 4

vi) ( - 1) - ( - 1) - 1 + ( - 1 )

vii) ( 10 + 20 ) / ( 2 - 4 )

viii) ( 18 X ( 2 - 3) X 4 ) / ( 4+ 14)

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