Solution 1.1:6d

From Förberedande kurs i matematik 1

In the text, 2  is given to 30 decimal places,

2=1414 213 562 373 095 048 801 688 724 210  

and from this decimal expansion, we see that √2 to three decimal places is

2=1414 

because the fourth decimal is 2 and is therefore rounded down.