Occasionally the results from one of the test cannot br ued, either because a special handicap of the subject made the administration of that be prorated to obtain a Verbal or Performance Score the can be used in deriving an IQ. If it is one of thr Verbal test that has been omitted, the sum of the scaled scores for the five other Verbal test is multiplied by six fifths (6/5) to yield the Verbal Score. If a Pergormance test has been omitted, the sun of the scaled scores for the four remaining Performance test is multiplied by five fourths (5/4) to determine the Performnce Score. It is possible to prorate four Verbal test by multiplaying the sum of their scaled scores by 3/2, and to prorate three Performance test by the factor of 5/3, but this is inadvisable.