For the first one and the third one, use the same concept of being able to flip the denominator if it was a fraction and change the question to multiplication.
For the second one, what you do is multiply
#1/6 xx 2 = 2/6=1/3#
It takes two sixths to make
Using the shortcut method
So that you fully understand what is going on write 1 as
Let the unknown number be
Multiply by 1 and you do not change the value. However, 1 comes in many forms so you can change the way a value looks without changing 'what it is worth'.
So it takes two sixths to make
Using the shortcut method of turning upside down and multiplying