The question is:
How many of these:  

will fit in one of these?:  

We can easily see just by looking at the size of them that more than 1 
of them but a lot less than 2 of them will fit in there.

The area of the 10cm by 10cm square is  A = s2 = (10cm)2 = 100cm2.

The area of the 13cm diameter circle, which has radius cm, is
A = pr2 =  =  =  = 132.7322896 cm2

Dividing 132.7322896 by 100 we get 1.327322896 of the squares will fit
inside the circle,

So not quite  of those squares will fit in that circle. 

Edwin