Step 7 Objective
Divide a quantity into two or more parts in a given ratio; use the unitary method to solve simple word problems involving ratio and direct proportion.
- Examples of what pupils should
know and be able to do - Probing questions
- What if pupils find
this a barrier?
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.