Question

how many lead balls each of ratius 1cm, can be made from a sphere of radius 8cm

Answer 1

first get the volume of the the larger lead ball which is 4πr² or 4π64 or 256π cm³
now get the area of the smaller sphere means 4π now you need to know how many small spheres can be made? Divide 256π with 4π and we get 64 and where is the π? it cuts itself out.
You can make 64 little spheres from it.