The CAS Registry Mumber 59710-47-3 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 5,9,7,1 and 0 respectively; the second part has 2 digits, 4 and 7 respectively. Calculate Digit Verification of CAS Registry Number 59710-47: (7*5)+(6*9)+(5*7)+(4*1)+(3*0)+(2*4)+(1*7)=143 143 % 10 = 3 So 59710-47-3 is a valid CAS Registry Number.