Fraction-Decimals converter

In a Math classroom manually children convert fractions to decimals upto a limited number of decimal places.
Do you know 1/9801 is purely recurring with a period of 198 digits?
1/9801 = 0.0001020304050607080910111213141516171819202122232425262728293031323334353637383940414243444546474849505152535455565758596061626
36465666768697071727374757677787980818283848586878889909192939495969799..

You must be surprised how I have calculated this. This is done on a click of a mouse button using an online converter.
Explore it yourself and find interesting Math.
Here is the link.