The CAS Registry Mumber 60237-75-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 6,0,2,3 and 7 respectively; the second part has 2 digits, 7 and 5 respectively. Calculate Digit Verification of CAS Registry Number 60237-75: (7*6)+(6*0)+(5*2)+(4*3)+(3*7)+(2*7)+(1*5)=104 104 % 10 = 4 So 60237-75-4 is a valid CAS Registry Number.