This game was shared at Vibhooti Chinmaya Mission Camp -- and it is absolutely brilliant!!
All the children sit in a circle with their eyes closed. The circle leader then takes a handful of pebbles (or marbles) and drops them into a metal pot. First very rhymically, slowly, -- then speeds up a little ... and slows down again. It is important to vary the rhythm of dropping the marbles so that the children really must focus on their counting. When all the items have been dropped, go around the circle and ask each child how many marbles are in the pot.