This is basic concept of number. Every digit in number will represent different value. Maybe some of you said, " i already know about this". So that is good. Try you imagine, what will be happen if you can't differentiate between every digit. Hear i put a picture to show a different between number. Example 1: 7 012 (it have four digit. so look at table four from right. It is 7 thousand and 21. To help how to say and write number, read my previous tips.)
