The CAS Registry Mumber 70496-41-2 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 7,0,4,9 and 6 respectively; the second part has 2 digits, 4 and 1 respectively. Calculate Digit Verification of CAS Registry Number 70496-41: (7*7)+(6*0)+(5*4)+(4*9)+(3*6)+(2*4)+(1*1)=132 132 % 10 = 2 So 70496-41-2 is a valid CAS Registry Number.