The CAS Registry Mumber 37275-76-6 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,7,2,7 and 5 respectively; the second part has 2 digits, 7 and 6 respectively. Calculate Digit Verification of CAS Registry Number 37275-76: (7*3)+(6*7)+(5*2)+(4*7)+(3*5)+(2*7)+(1*6)=136 136 % 10 = 6 So 37275-76-6 is a valid CAS Registry Number.