There are lots of ideas to explore in these sequences of ordered fractions.
At the beginning of the night three poker players; Alan, Bernie and Craig had money in the ratios 7 : 6 : 5. At the end of the night the ratio was 6 : 5 : 4. One of them won $1 200. What were the assets of the players at the beginning of the evening?
According to Plutarch, the Greeks found all the rectangles with integer sides, whose areas are equal to their perimeters. Can you find them? What rectangular boxes, with integer sides, have their surface areas equal to their volumes?
The diagram below shows circles with radii 3, 4, 5, 6 and 7 cm.
What fractions of the largest circle are each of the two shaded regions?