Rice 2 – A Rice Mountain or Molehill – Maths

In this lesson the class explores simple weight measurements and also work out the proportions of ingredients in a Geobar.

Curriculum links: KS2 Maths

Learning Objective: to recognise simple weight measurements and apply measuring skills.

Learning Outcome: children have accurately measured out a variety of ingredients. Children have used maths skills to work out the proportion of ingredients in the Geobar.

Resources needed: recipe(s), rice, weighing scales for each pair, other ingredients if class intends to cook dish, a Geobar.

Starter: Give each pair a set of weighing scales and some rice. Ask each pair first to estimate how much rice they would need for 50g, 100g, 200g, 250g and then to measure the correct amount and compare their results.
Choose an appropriate Indian or Thai recipe which involves numerous ingredients, e.g. vegetable biriyani. Give each pair a differentiated version of the recipe and weighing scales and challenge children to accurately measure all the ingredients, and if possible, to actually make the dish.

If class is developing a cook book they can use this activity to test their recipes and develop a tasting chart. The recipes can then be rated with your own class stars!

Main Activity: Look at a Geobar with the class or use the figures below of a Raisin and Mixed Berry Geobar to work from (adapt them as appropriate for your class)

1. Estimate the Geobar’s weight and then weigh it to check (32g)

2. Look at the ingredients. What proportion of Fairtrade rice does it contain?(8.6%)

3. How much rice (in grams) is this?

4. Measure the correct amount. What does it look like? Are pupils surprised?

Discuss Fairtrade with the class. What is it? How does buying a Geobar containing Fairtrade rice help rice producers? (all of the guarantees of the Fairtrade Mark apply – they get a fair price for their rice, good working conditions and a ‘Fairtrade premium‘ to invest in community development)

5. Ask pupils to work out how much rice is bought from Fairtrade rice growers if the following amounts of Geobars are bought (use other figures if appropriate)

(a)100 (b) 500 (c) 1000 (d) 15,000 (e) 50,000 (f) 100,000 (g) 1,000,000

6. In March 2009 2,344,128 Geobars were sold across the world. How much rice was bought from fairtrade farmers?

Plenary: Pupils listen to/read some of the producer stories from Agrocel, India. What difference has Fairtrade made to their lives?

Some groups may want to go on to look at the ingredients the class used in their recipe more closely. Where do they come from in the world? Are the imported to the UK? How many ‘air miles’ has the dish travelled? Is the dish healthy? Why?