Positional Notation

${10}^4,{10}^3,{10}^2,{10}^1,{10}^0$

$10000,1000,100,10,1$

$2,7,9,1,6$

$20000+7000,+900,+10,+6$

$=27916$

The magnitude of a number is determined by multiplying the magnitude of the column by the digit in the column and summing the products

Explain this to me