106 



Indiana University Studies 



In May Series B was given a second time. The results have 

 been computed from the differences between the scores of the 

 two tests. They can be used as suggestive only, inasmuch as 

 before school closed the number of pupils remaining in each 

 group (7) was much too small for positive conclusions. 



Speed. — In Table II are found the scores in attempts and 

 rights for each pupil in each operation together with the group 

 scores, which are the totals of the individual scores, and the 

 group medians. Using the group scores as the basis of computa- 

 tion. Table III gives the per cent of gain made during the year 

 by each group and the difference in gains by practiced and un- 

 practiced groups. 



TABLE III.— PER CENT OF GAIN (IN MAY OVER SEPTEMBER) 

 IN SPEED OF PRACTICED AND UNPRACTICED GROUPS 





Unpracticed 



Practiced 



Gain of Prac- 

 ticed over 

 Unpracticed 



Grade 5 











30 



43 



13 



Subtraction 



27 



54 



27 



Multiplication 



12 



148 



136 



Division 



0 



144 



144 



Grade 6 









Addition 



43 



60 



17 



Subtraction 



28 



49 



21 



Multiplication 



51 



88 



37 



Division 



76 



129 



53 



Thus the speed gain made in addition during the year by the 

 fifth grade unpracticed group is 30 per cent, while the practiced 

 group gained 43 per cent. In the sixth grade the unpracticed 

 group made a gain of 43 per cent and the practiced group 60 per 

 cent. Comparing the gain made by the practiced group over 

 the unpracticed, it is found in grade 5 to be 13 per cent in addition, 

 27 per cent in subtraction, 136 per cent in multiplication, and 144 

 per cent in division. In the sixth grade it is 17 per cent in addi- 

 tion, 21 per cent in subtraction, 37 per cent in multiplication, 

 and 53 per cent in division. The gain in speed in the fifth grade 

 is particularly noticeable, and varies greatly. The sixth grade 

 gains do not vary so much. The greatest gain in both grades 

 is in multiplication and division. 



