Year level: 4

Strand: Number, Algebra

Lesson length: 60 mins

In this first of three lessons, students use efficient strategies when performing calculations involving money. They explore different ways to estimate and calculate the distribution of pocket money.

### Achievement standard

Students use their proficiency with addition and multiplication facts to add and subtract, multiply and divide numbers efficiently.

### Content descriptions

Students develop efficient strategies and use appropriate digital tools for solving problems involving addition and subtraction, and multiplication and division where there is no remainder. AC9M4N06

Students recall and demonstrate proficiency with multiplication facts up to 10 x 10 and related division facts; extend and apply facts to develop efficient mental strategies for computation with larger numbers without a calculator. AC9M4A02

### General capabilities

Numeracy

Critical and Creative Thinking

• Analysing: Interpret concepts and problems Inquiring
• Inquiring: Identify, Process and Evaluate information
• Observe the working out in students’ workbooks during the reflection and make notes on what you have observed.
• Listen to students’ explanations during the reflection.
• Notice the level of difficulty based on the student’s choice of sharing, for example, equal amounts for each job or exploring the use of different amounts allocated to jobs performed.
• Be familiar with the concept of pocket money
• Estimation and approaches to making an estimate
• Share dollar amounts in different ways

Some students may:

• experience difficulties reading and understanding the learning task. There are many choices students can make in relation to the task, for example, amount of money selected to be shared, the ways the money is shared (equally, unequally), and the allocation of different values to the jobs performed
• find it challenging to identify that there are multiple ways of partitioning numbers resulting in equal and/or unequal parts
• require support to use efficient strategies to partition numbers into different sized parts
• require support to use additive thinking to check solutions for accuracy, inverse relationship between addition and subtraction
• find it challenging to make reasonable estimates for money amounts allocated to specific household jobs.

## What you need:

• Lesson plan (Word)

• Teacher’s slides: efficient strategies (PowerPoint)

• Teacher’s slides: classroom talk (PowerPoint)