The CAS Registry Mumber 76245-98-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,6,2,4 and 5 respectively; the second part has 2 digits, 9 and 8 respectively. Calculate Digit Verification of CAS Registry Number 76245-98: (7*7)+(6*6)+(5*2)+(4*4)+(3*5)+(2*9)+(1*8)=152 152 % 10 = 2 So 76245-98-2 is a valid CAS Registry Number.