Student or Learner
He laid on the table a small ornamental wooden box about half as big again as a matchbox, and one of those puzzles consisting of two large nails so bent that they are linked together, but will, when held in the right positions, slide easily apart.
(The Midwich Cuckoos; J. Wyndham)
Am I right in thinking that that box was one-and-a-half times as big as a matchbox?
"Half again as big" is how it is normally said.
not a teacher
It must be a regional difference, I would say and almost exclusively hear "Half as big again".