Worth x Value: Qual a diferença?

Hi People,
I am an old frequenter of this forum, But I never had posted before, its because all of my doubts always were answered by others posts, but today I mustered up courage and will post my first written doubt, lets go.

I'm in a terrible doubt, I don't known what is correct, the usage of Value or Worth according the phrases below. If you could help me, I'd be very satisfying.

Follow:

The value/worth of this present is too much expensive!

I was calculating the estimated worth/value.

We have to give more worth/value to the people that we like!

Do you give worth/value to the people that love you?

Advanced Thanks for you attention!