The influence of the place-value structure of the Arabic number ...

APPENDIX A
Stimulus properties of the used item set
Small problem size
Large problem size
Non-carry Carry Non-carry Carry
Summand 1 9.92 10.38 41.29 38.46
Summand 2 10.42 10.29 41.58 43.21
Problem size categorical 1 1 2 2
Carry yes/no 0 1 0 1
Correct sum (= problem size) 20.33 20.67 82.88 81.67
log correct sum 1.28 1.29 1.92 1.91
Decade sum 1.25 0.75 7.58 6.83
Unit sum 7.83 13.17 7.04 13.33
Smaller summand left 0.50 0.50 0.50 0.50
Parity summand 1 1.67 1.29 1.46 1.46
Parity summand 2 1.33 1.46 1.42 1.46
Parity correct sum 1.25 1.33 1.38 1.33
5 in unit position of summand 1 0.17 0.17 0.17 0.17
5 in unit position of summand 2 0.17 0.17 0.17 0.17
5 in unit position of correct sum 0.08 0.08 0.08 0.08
5 in decade position of summand 1 0.00 0.00 0.04 0.04
5 in decade position of summand 2 0.00 0.00 0.04 0.04
5 in decade position of correct sum 0.00 0.00 0.00 0.00
Decade of summand 1 0.58 0.38 3.75 3.21
Decade of summand 2 0.67 0.38 3.83 3.63
Unit of summand 1 4.08 6.63 3.79 6.38
Unit of summand 2 3.75 6.54 3.25 6.96
Decade of correct sum 1.25 1.75 7.58 7.83
Unit of correct sum 7.83 3.17 7.04 3.33
Incorrect solution probe (distractor) 22.00 22.33 84.54 83.33
log distractor 1.31 1.33 1.92 1.92
Distance between sum/distractor -1.67 -1.67 -1.67 -1.67
Absolute value distance
sum/distractor
6.00 6.00 6.00 6.00
Decade crossing sum/distractor 0.50 0.50 0.50 0.50
83