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There are plenty of opportunities to use a variety of mathematics. More and less, and difference, will be covered as data are discussed. Depending on how the data are presented, children will be approximating amounts, and using the vocabulary of fractions and ratios in order to make sense of the information. Through this process, they will gain a good understanding of what amounts 'look' like. As the village has $100$ residents, number bonds to $100$ will also feature. With older children, this could link to work with percentages.
There are obvious cross-curricular links with Geography and PSHE here, as the data in the book really make us think about the haves and have-nots of our world, the differences between countries and peoples, and also what unites us all.
Begin by reading the welcome message on page $7$. Here, the author explains how the world's population ($6,660,000,000$) is represented in the imaginary village of $100$ residents so that each resident represents approximately $67$ million people from the real world.
Share the images here and ask the children to interpret the information. It'll be worth having access to a world map! Discuss the merits of different representations and, if appropriate, compare the data with that of your school community. You might also consider using 100 CHILDREN to represent the village. This would be especially powerful when you come to talk about issues such as who has wealth, electricity, televisions - things that your class will feel strongly about! If you're one of the 100 who doesn't have a TV then how does that feel?
In groups, give the children a set of data and ask them to decide how to present it. Some of the pages in the book are easier to interpret and represent than others, so there's some natural differentiation.
Provide a range of resources to use to represent the information: cubes, bean bags, post-it notes, images that can be cut out, paper and pens, small world models, dried pulses/pasta, beads ... Expect groups to change their minds about how to present their data. They want their representation to have maximum impact - you might even insist that they try a number of different representations before deciding on their final arrangement.
Once the data are presented in a physical/visual way, you might ask each group to prepare a little 'fact-sheet' about their data so that 'visitors' to the class 'gallery' can understand what they're looking at. This information could also of course be recorded on small devices (such as Talking Tins or Talk-Time Postcards) which could be sited next to the displays.
When the 'gallery' is opened, the group members can take it in turns to be the 'curator' of their data and explain what they show to 'visitors'. This requires a certain amount of role playing on all parts! The visitors can be children from their own class, other classes from within the school, parents, members of staff, governors ...
Working in this way provides more cross-curricular opportunities because there may be a need to make invitations, issue tickets, serve refreshments, run a cloakroom, carry out security checks and much else besides!