Two equations #1
After filling the numbers in the empty patches there arise two equations with the equal result (ABCD). In each equation you can use only the numbers from 1 to 9 exactly once. Solve both equations.
Two equations #2
Same as #1 only now the result is ABCDE and you have to use the numbers 0 to 9 exactly once.
Two equations #3
Two equations have the same solutions, same characters are same numbers. Replace the characters with numbers.
AB x CD = AABC
BA x DC = AABC
Two equations #4
Same as #4
AC x DC = AABC
CA x CD = AABC
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