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Which is bigger, $\frac{2}{5}$ or $\frac{1}{3}$?
How do you know?
Is there more than one way of convincing yourself that one is bigger than the other?
What if you had the fractions $\frac{2x}{5}$ and $\frac{x}{3}$? Would your answer be the same?
Here are some more pairs of fractions for you to try.
If you are working with others you may wish to tackle examples separately and then compare approaches and conclusions.
You may like to print and cut out the pairs of fractions on cards, so that they may be attempted in any order.