Examples of what pupils should know and be able to do
Solve problems such as:
- Potting compost is made from loam, peat and sand in the ratio 7 : 3 : 2 respectively. A gardener used 1.5 litres of peat to make compost. How much loam did she use? How much sand?
- The angles in a triangle are in the ratio 6 : 5 : 7. Find the sizes of the three angles.
- FTM(S) Y789 page 81 - Acrobat pdf document (37Kb)
- Ratio (adapting a recipe) example of pupil's work - Acrobat pdf document (379Kb)
Probing questions
If the ratio of boys to girls in a class is 3 : 1, could there be exactly
30 children in the class?
Why?
Could there be 25 boys?
Why?
5 miles is about the same as 8 km. Can you make up some conversion questions
that you could answer mentally?
Can you make up some conversion questions for which you would have to use
a more formal method?
How would you work out the answers to these questions?
What if pupils find this a barrier?
Use ratio strips ITP - Zip file (458Kb) to provide a visual image to support the understanding of ratio, e.g. to divide £44 in the ratio 1 : 3
See phase 3 of the unit plan in the Year
8 multiplicative relationships mini pack - Acrobat pdf document (203Kb) which is focused on problem
solving.
- T5 snapper 5 - Microsoft word document (36Kb)
- Securing level 5 9N4.1 - Acrobat pdf document (44Kb)
- Securing level 5 9N4.3 - Acrobat pdf document (53Kb)
- Securing level 5 9P1.3 - Acrobat pdf document (34Kb)
<< Previous Step | Next Step >>