The CAS Registry Mumber 1070879-61-6 includes 10 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 7 digits, 1,0,7,0,8,7 and 9 respectively; the second part has 2 digits, 6 and 1 respectively. Calculate Digit Verification of CAS Registry Number 1070879-61: (9*1)+(8*0)+(7*7)+(6*0)+(5*8)+(4*7)+(3*9)+(2*6)+(1*1)=166 166 % 10 = 6 So 1070879-61-6 is a valid CAS Registry Number.