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Allowed in every UK exam where a calculator can be used. Casio fx-991 CW Casio’s most advanced scientific calculator with 540 + mathematical functions. Casio fx-991CW Advanced Scientific Calculator. The Casiofx-991 CW is Casio’s most advanced scientific calculator with540 + mathematical functions.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.