The CAS Registry Mumber 98360-52-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 9,8,3,6 and 0 respectively; the second part has 2 digits, 5 and 2 respectively. Calculate Digit Verification of CAS Registry Number 98360-52: (7*9)+(6*8)+(5*3)+(4*6)+(3*0)+(2*5)+(1*2)=162 162 % 10 = 2 So 98360-52-2 is a valid CAS Registry Number.