Key learning points

1. Visualising and representing problems as bar models (by identifying the parts and whole) helps us to solve problems..
2. The bar model helps us to understand the structure of the maths and to form a calculation to help solve the problem.
3. If parts are unequal, we can use additive relationships; if parts are equal, we can use multiplicative relationships.
4. Number facts can be used when solving problems involving mass.

Keywords

• Bar model - A bar model is a pictorial representation of a problem where bars are used to represent the known and unknown quantities.

• Whole - The whole is all of something. It is complete.

• Part - A part is some but not all of something. It is an amount or section which, when combined with others, makes up the whole.

• Volume - Volume is the amount of space that an object takes up. In this case, the specific amount of liquid in a container. It can be measured in ml.

Common misconception