The CAS Registry Mumber 70959-70-5 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,0,9,5 and 9 respectively; the second part has 2 digits, 7 and 0 respectively. Calculate Digit Verification of CAS Registry Number 70959-70: (7*7)+(6*0)+(5*9)+(4*5)+(3*9)+(2*7)+(1*0)=155 155 % 10 = 5 So 70959-70-5 is a valid CAS Registry Number.