The CAS Registry Mumber 56059-62-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,6,0,5 and 9 respectively; the second part has 2 digits, 6 and 2 respectively. Calculate Digit Verification of CAS Registry Number 56059-62: (7*5)+(6*6)+(5*0)+(4*5)+(3*9)+(2*6)+(1*2)=132 132 % 10 = 2 So 56059-62-2 is a valid CAS Registry Number.