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Discover LudwigThe phrase "about half that quantity" is correct and usable in written English.
It can be used when discussing measurements, amounts, or quantities in a context where you want to indicate an approximate value that is roughly 50% of a previously mentioned quantity.
Example: "If the original recipe calls for two cups of sugar, you can use about half that quantity for a less sweet version."
Alternatives: "roughly half that amount" or "approximately half of that quantity."
Exact(1)
When this has thickened add half a tumbler of red wine or about half that quantity of Marsala.
Similar(59)
"Yeezus" sold about half that number.
Incoming manufacturers pay about half that.
Now it contributes about half that.
Official figures suggest about half that number.
Recently it's managed about half that.
It currently invests about half that.
Fire turns into water ("sea"), and then half of that quantity turns into earth and half into "fireburst" (prêstêr, a fiery, windy kind of storm phenomenon).
About half that time we have argued.
The risk in Chinese was about half that of Whites.
That took about half a day.
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Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com