The CAS Registry Mumber 107293-07-2 includes 9 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 6 digits, 1,0,7,2,9 and 3 respectively; the second part has 2 digits, 0 and 7 respectively. Calculate Digit Verification of CAS Registry Number 107293-07: (8*1)+(7*0)+(6*7)+(5*2)+(4*9)+(3*3)+(2*0)+(1*7)=112 112 % 10 = 2 So 107293-07-2 is a valid CAS Registry Number.