'Shekels' in the Bible

My lord, give ear to me: the value of the land is four hundred shekels; what is that between me and you? so put your dead to rest there.

And Abraham took note of the price fixed by Ephron in the hearing of the children of Heth, and gave him four hundred shekels in current money.

And when the camels had had enough, the man took a gold nose-ring, half a shekel in weight, and two ornaments for her arms of ten shekels weight of gold;