The CAS Registry Mumber 1602492-06-7 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,6,0,2,4,9 and 2 respectively; the second part has 2 digits, 0 and 6 respectively. Calculate Digit Verification of CAS Registry Number 1602492-06: (9*1)+(8*6)+(7*0)+(6*2)+(5*4)+(4*9)+(3*2)+(2*0)+(1*6)=137 137 % 10 = 7 So 1602492-06-7 is a valid CAS Registry Number.