The CAS Registry Mumber 1008965-37-4 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,0,0,8,9,6 and 5 respectively; the second part has 2 digits, 3 and 7 respectively. Calculate Digit Verification of CAS Registry Number 1008965-37: (9*1)+(8*0)+(7*0)+(6*8)+(5*9)+(4*6)+(3*5)+(2*3)+(1*7)=154 154 % 10 = 4 So 1008965-37-4 is a valid CAS Registry Number.