They are: 3*7 = 21 or 1*21 = 21
1 x 63, 3 x 21, 7 x 9.
How about: 3*7 = 21 or 1*21 = 21
It is the multiplication result of 26 and 21 as they don't have any common number.
22x111x21x222x11
1 x 21 3 x 7 7 x 3 21 x 1
1 x 21, 3 x 7.
21x1 and 3x7
6x2x2
Product is found by multiplication, therefore 21 multiplied by 4 (21 * 4) = 84
37 x 2
How about: 8*9 = 72
Example: 7 x 3 = 21 or 7 + 7 + 7 = 21