Basic Mathematics: NUMBERS

First Lesson of the series basic mathematics, i know this is some really basics stuff but its here for completion sake. Video contents:

Natural Numbers:......................................0:42 Infinity:........................................................0:56 Integers:.....................................................1:57
Operations with Integers:..........................2:56 Absolute Value:..........................................5:20 Rational Numbers:.....................................5:52 Operations with Rational Numbers:..........6:49 ... https://www.youtube.com/watch?v=kWsUmqYCsMY