Answers

2014-07-24T13:01:53+05:30
By colours of thing, their textures etc. they learnt about them.
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2014-07-24T13:13:07+05:30
Numbers are everywhere. We use them to count or measure things. But during the early history of man, written number did not exist. Early man counted things with the help of fingers, sticks, stones, etc. People in the early period needed tools to help them count. 
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