The CAS Registry Mumber 78437-60-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,8,4,3 and 7 respectively; the second part has 2 digits, 6 and 0 respectively. Calculate Digit Verification of CAS Registry Number 78437-60: (7*7)+(6*8)+(5*4)+(4*3)+(3*7)+(2*6)+(1*0)=162 162 % 10 = 2 So 78437-60-2 is a valid CAS Registry Number.