Ten cubits shall be the length of a board - Each of these boards or planks was about five yards and two feet and a half long, and thirty-two inches broad; and as they are said to be standing up, this was the Height of the tabernacle. The length being thirty cubits, twenty boards, one cubit and a half broad each, make about seventeen yards and a half, and the Breadth was about five yards.

tenons Heb. hands

Exodus
The book of Exodus--so named in the Greek version from the march of Israel out of Egypt--opens upon a scene of oppression very different from the prosperity and triumph in which Genesis had closed. Israel is being cruelly crushed by the new dynasty which has arisen in Egypt (i.) and the story of the book is the story of her redemption. Ultimately it is Israel's God that is her redeemer, but He operates largely by human means; and the first step is the preparation of a deliverer, Moses, whose parentage, …
John Edgar McFadyen—Introduction to the Old Testament