Logical number puzzles contain very interesting challenges where some numbers relate to each other with mathematical or logical relationships. Your puzzle challenge in these logical reasoning puzzles is to find this hidden relationship among these numbers and then find the missing number.

 1. Mastering Patterns in Number Puzzles: Crack the Code

Each of the logical reasoning number puzzles in this post contains 5 numbers. There is a hidden relationship in these numbers. Can you find this relationship and find the missing number.
There are 5 number puzzles in this post. Let's see how many of these logical puzzles you can crack!

 2. Mastering Patterns in Number Puzzles: Crack the Code

 3. Mastering Patterns in Number Puzzles: Crack the Code

 4. Mastering Patterns in Number Puzzles: Crack the Code

 5. Mastering Patterns in Number Puzzles: Crack the Code

The answers to these "Crack the Code Number Puzzles", can be viewed by clicking the answer button.

A B
C
D E

1. 20
(A*B) + (D+E) = C

2. 2
AB=C+D+E

3. 40
(B*D)-(A*E)=C

4. 10
C=(B+D)-(A+E)

5. 88
C=AB+DE