Please can anyone help me explain these examples

The product of the ones in the middle is the same as the product of the ones on the sides...

That is to say, 2x3= 6
So is 3x2= 6 as well...

2nd example
4x3=12
6×2=12 too

3rd example, 10x3=30
6x5= 30 too

The concept is very easy what you are to do is to divide the value at the end to your right by the second value on top of the first and multiply your answer by by the first value
Here is an illustration
The first example:
2÷2 =1 and 1X3 =3
Example 2
3÷6= 0.5 an 0.5X4=2
Example 3
6÷3=2 and 2X5=10
With this I guess you can be able to answer the remaining questions.

Modified:
My concept gives you the answer directly and you can also use that of the OP above me to verify that you're correct