The CAS Registry Mumber 37148-98-4 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 3,7,1,4 and 8 respectively; the second part has 2 digits, 9 and 8 respectively. Calculate Digit Verification of CAS Registry Number 37148-98: (7*3)+(6*7)+(5*1)+(4*4)+(3*8)+(2*9)+(1*8)=134 134 % 10 = 4 So 37148-98-4 is a valid CAS Registry Number.