We all know that 12/25 + 18/30 is not 30/55 yet students are happily told that they got 12 out of 25 in their first maths test and 18 out of 30 in their second maths test giving a total of 30 out of 55(adsbygoogle = window.adsbygoogle || []).push({});

So in this case 12/25 and 18/30 is 30/55

So should we be surprised when students say 2/5 + 3/4 is 5/9 ?

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# Confusing Students with Fractions

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