Casio fx-83GT - HCF and LCM Calculations; HCF (Highest Common Factor) Calculation

Press
HCF (Highest Common Factor)
This is called GCD – Greatest Common Divisor
This brings up
GCD(
Find the HCF of 12 and 20
Choose Numeric Calc
Press
The choose GCD
Type 12,
(To get the comma)
, then type 20
Press
22