Today's lesson is on the subtraaction of mixed numbers. Since pupils already know the concept of subtracting unlike fractions, it's only a matter of time before they attained the concept of subtracting mixed numbers.
Instead of asking them to do the textbook activity, which I believe to be boring to most of the class, I decided to show the class some of the examples that my previous students did. (Which some contains errors in computation).
(Click for a larger view)
As shown above, can you figure out what did student A and student B went wrong? Can you also figure out how did they derive at their answer?
Up next.... Maths problem sums involving fractions!
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