/ ?
40/ ? = 5
40/ 8 = 5
12, 15, 18, 21
By 3
7x3
7x3= 21
9x2
9x2=18
3 x ? = 21
3 x 7 = 21
24 / ? = 3
24 / 8 = 3
8, 12, 16, 20
By 4
7x4
7x4= 24
9x4
9x4=36
? x 4 = 36
9 x 4 = 36
21 / ? = 3
21 / 7 = 3
24, 30, 36, 42
By 6
7x6
7x6= 42
9x6
9x6=54
9 x ? = 45
9 x 5= 45
49 / ? = 7
49 / 7 = 7
48, 56, 64, 72
by 8
7x8
7x8= 56
9x8
9x8=72
? x 7 = 77
11 x 7 = 77
500 / ? = 100
500 / 5 = 100
22, 33, 44, 55
by 11
7x11
7x11= 77
9x11
9 x 11 = 99
9 x ? = 90
9 x 10 = 90