The CAS Registry Mumber 22953-07-7 includes 8 digits separated into 3 groups by hyphens. The first part of the number,starting from the left, has 5 digits, 2,2,9,5 and 3 respectively; the second part has 2 digits, 0 and 7 respectively. Calculate Digit Verification of CAS Registry Number 22953-07: (7*2)+(6*2)+(5*9)+(4*5)+(3*3)+(2*0)+(1*7)=107 107 % 10 = 7 So 22953-07-7 is a valid CAS Registry Number.
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