AC9M2N05_E1
Make and name arrays and use bar models to solve simple multiplication and sharing problems. Explore how arrays can be turned while keeping the same total.
Chapter 5 • AC9M2N05
Help your child understand multiplication and division using arrays, equal groups, repeated addition, sharing, skip counting and bar models. This parent-friendly teaching guide explains the strategies used in Year 2 before children complete the printable activities aligned with AC9M2N05.
In Year 2, children begin developing multiplication and division understanding through practical experiences rather than memorising formal procedures.
Multiplication is introduced as repeated equal quantities. For example, 4 trays with 6 biscuits on each tray can be represented as 4 equal groups of 6.
Children may record the situation as repeated addition:
6 + 6 + 6 + 6 = 24
Division is explored through sharing and grouping. Children learn that these are related but different questions.
Arrays, bar models, physical materials, diagrams, skip counting and Think Boards help children represent these relationships and explain their calculation strategies.
These activities support Australian Curriculum Version 9.0 content descriptor AC9M2N05 and its associated elaborations.
Multiply and divide by one-digit numbers using repeated addition, equal grouping, arrays and partitioning to support a variety of calculation strategies.
Make and name arrays and use bar models to solve simple multiplication and sharing problems. Explore how arrays can be turned while keeping the same total.
Find totals represented by arrays by partitioning the array and using subitising, known number facts and repeated addition.
Recognise division situations and distinguish between sharing a collection into a given number of equal groups and making groups of a given size.
Use a Think Board to solve partition and quotition division problems with materials, diagrams, number sentences and skip counting.
Use materials, diagrams, repeated addition and skip counting to solve multiplication problems involving repeated equal quantities.
Children need to understand what the groups and objects represent before using number sentences or calculation strategies.
Multiplication combines equal groups to find a total. Division begins with a total and separates it into equal groups or groups of a chosen size.
For example, 3 groups of 4 can be shown as:
Children will learn to:
I can make equal groups.
I can write a repeated addition sentence.
I can make and name an array.
I can identify rows and columns.
I can find the total in an array.
I can partition an array into smaller known parts.
I can use skip counting to find a total.
I can represent multiplication with a bar model.
I can share a collection equally.
I can make groups of a chosen size.
I can explain the difference between sharing and grouping.
I can explain what my answer means.
Teachers normally introduce multiplication and division using physical materials and familiar situations before introducing symbolic number sentences.
At home, follow this sequence: make it, arrange it, draw it, count it and explain it.
Give your child counters, buttons, blocks or other small objects. Ask them to make equal groups.
For example:
“Make 4 groups with 3 counters in each group.”
Count the number in each group and check that all groups contain the same quantity.
“There are 4 equal groups. Each group contains 3 counters. Altogether there are 12 counters.”
Once the groups have been made, write an addition sentence using the same quantity repeatedly.
Four groups of 3 can be written as:
3 + 3 + 3 + 3 = 12
Ask your child to point to each group as they say each addend. This helps connect the written number sentence to the physical model.
Instead of counting every object individually, encourage your child to skip count by the number in each group.
For 4 groups of 3:
3, 6, 9, 12
Explain that each skip represents another equal group being added.
Children should understand the groups before relying on skip counting. Skip counting without a model can become a memorised sequence with little meaning.
Arrange objects into straight rows and columns.
For example, 12 objects could be arranged as:
Ask your child to describe each arrangement using equal-group language such as “3 fours” or “4 threes”.
Build an array with 3 rows of 4. Turn it so it becomes 4 rows of 3.
Ask:
Children should notice that the arrangement changes but the total remains 12.
“3 fours” and “4 threes” have the same total even though the rows and columns have been exchanged.
Draw one long bar divided into equal sections.
For 3 groups of 4, divide the bar into 3 equal sections and label each section 4.
The complete bar represents the total:
4 + 4 + 4 = 12
Bar models help children connect the group size, number of groups and total.
Children do not always need to count every object in an array. They can divide the array into smaller known parts.
For a 3-by-5 array:
Encourage your child to explain:
“I saw 2 fives, which is 10, and then 5 more, which makes 15.”
Arrays can be broken into familiar facts.
For example, a 4-by-6 array could be partitioned into:
Children may also recognise doubles, groups of 5 or groups of 10.
Sharing division begins with a total and a known number of groups.
Example:
“Share 12 counters equally between 3 people.”
Deal one counter to each person in turn until all counters have been shared.
Each person receives 4 counters.
The number of groups is known. The number in each group is being found.
Grouping division begins with a total and a known group size.
Example:
“Place 12 counters into groups of 3.”
Make groups containing exactly 3 counters until all counters have been used.
Four groups can be made.
The number in each group is known. The number of groups is being found.
Use the same total to compare the two division situations.
With 12 objects:
Both answers involve 4, but the 4 represents something different.
“Does the answer tell us the number of groups or the number in each group?”
A Think Board allows children to represent the same problem in several ways.
A division Think Board may include:
For example:
“A prize of $36 is shared equally between 4 people.”
Children may draw 4 groups, share $36 equally, skip count or use repeated subtraction to determine that each person receives $9.
The answer 9 represents dollars received by each person.
Read a problem such as:
“There are 4 trays with 6 biscuits on each tray. How many biscuits are there altogether?”
Ask your child to:
The repeated addition sentence is:
6 + 6 + 6 + 6 = 24
A numerical answer is incomplete if the child cannot explain what it represents.
Ask:
Count the objects in each group and compare them. Multiplication and division in this unit involve equal groups.
Ask the child what groups or known facts they can see before counting individual objects.
Describe rows as going across and columns as going down. Ask the child to point to each row and column.
Turn the same physical array without adding or removing any objects. Recount or partition it to verify the total.
Each addend should represent the number in one equal group. Point to each group while writing the sentence.
Ask two separate questions: “How many groups are there?” and “How many objects are in each group?”
Use the same collection to demonstrate both situations and discuss what is known and what is unknown.
Ask the child to finish the answer using a unit, such as “9 dollars for each person” or “4 groups”.
When finding a multiplication total, skip count by the number in each group and count one skip for each group.
Rearrange or redistribute the materials so every group has the same amount before writing repeated addition.
Give your child a collection of counters and ask them to make a chosen number of equal groups.
Count the groups, count the objects in each group and find the total.
Focus: Equal grouping.
Make a set of equal groups and ask your child to write the matching repeated addition number sentence.
Change the groups and repeat.
Focus: AC9M2N05_E5.
Arrange buttons, blocks or coins into equal rows and columns.
Ask your child to name the array and calculate its total.
Focus: AC9M2N05_E1.
Build an array, turn it and describe the new arrangement.
Discuss why the total remains unchanged.
Focus: Turning arrays.
Cover part of an array with paper or draw a dividing line through it.
Ask your child to find each smaller total and combine the parts.
Focus: AC9M2N05_E2.
Share 12, 16, 20 or 24 objects equally among a chosen number of plates or people.
Ask how many objects each group receives.
Focus: Sharing division.
Give your child a collection and ask them to make groups of 2, 3, 4 or 5.
Ask how many complete groups can be made.
Focus: Grouping division.
Draw a bar divided into equal sections and write the quantity represented by each section.
Find the total and write the repeated addition sentence.
Focus: Bar models.
Choose one multiplication or division problem and represent it with objects, a drawing, a number sentence and a written explanation.
Focus: AC9M2N05_E4.
Create problems involving equal quantities on trays, plates, shelves or containers.
Ask your child to draw the groups, write repeated addition and skip count to find the total.
Focus: Repeated equal quantities.
There are _____ equal groups.
There are _____ objects in each group.
The repeated addition sentence is _____.
I skip counted by _____.
The total is _____.
The array has _____ rows and _____ columns.
I can name the array as _____.
When I turned the array, _____.
I partitioned the array into _____ and _____.
I used the number fact _____.
I shared _____ objects into _____ equal groups.
Each group received _____.
I made groups of _____.
I made _____ complete groups.
The answer represents _____.
I checked my answer by _____.
Use these questions to check whether your child understands the main ideas.
A child shows secure understanding when they can represent equal groups, find totals efficiently, distinguish between sharing and grouping, and explain what the answer means.
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Multiplication and division understanding grows through repeated practical experiences with equal groups, arrays and sharing.
Use this simple routine:
Children who need additional support can revisit these earlier counting, grouping, sharing and addition topics.
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