Doplň chýbajúce čísla v číselných radoch:
6, 9, 12, 15, , 21, ,
21, , 35, 42, , 56,
45, 40, 35, , , 20, ,

4 . 2 =	. 8 = 24	. 3 = 18	14 : 2 =	24 : = 6
3 . 5 =	2 . = 12	4 . = 16	35 : 5 =	50 : = 10
7 . 4 =	. 6 = 30	. 9 = 27	36 : 6 =	: 8 = 3
1 . 8 =	7 . = 21	10 . = 40	6 : 2 =	: 2 = 9