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. Author manuscript; available in PMC: 2014 Oct 1.
Published in final edited form as: Dev Psychol. 2012 Dec 17;49(10):1994–2004. doi: 10.1037/a0031200

Table 2.

Gains in Fraction Arithmetic Accuracy from 6th to 8th Grade Among Low Achieving (LA) and Higher Achieving (HA) Children

Operation Denominators % Accuracy Gain
(8th minus 6th)
LA HA
Addition Equal 6 12
Unequal 4 22*
Subtraction Equal 10 13
Unequal 3 20*
Multiplication Equal 6 20*
Unequal 9 31*
Division Equal 11 36*
Unequal 11 40*

Note: Gains = 8th grade – 6th grade percent correct.

*

indicates significance at p <.05