The CAS Registry Mumber 101560-47-8 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,1,5,6 and 0 respectively; the second part has 2 digits, 4 and 7 respectively. Calculate Digit Verification of CAS Registry Number 101560-47: (8*1)+(7*0)+(6*1)+(5*5)+(4*6)+(3*0)+(2*4)+(1*7)=78 78 % 10 = 8 So 101560-47-8 is a valid CAS Registry Number.