# Multiplicative strategies

## Learning intention

Students will develop their efficiency, flexibility and confidence in using a variety of mental strategies to solve problems of a multiplicative nature. They will use their own informal recordings to represent their strategies and communicate effectively with others. Students will also deepen their understanding of the operations themselves and the inverse relationship between multiplication and division.

### Syllabus outcome

• MA2-1WM: uses appropriate terminology to describe, and symbols to represent, mathematical ideas
• MA2-2WM: selects and uses appropriate mental or written strategies, or technology, to solve problems
• MA2-3WM: checks the accuracy of a statement and explains the reasoning used
• MA2-4NA: applies place value, informally, to count, order, read and represent two- and three-digit numbers
• MA2-6NA: uses mental and informal written strategies for multiplication and division
• MA2-7NA: represents and models halves, quarters and eighths
• MA2-10MG: measures, records, compares and estimates areas using square centimetres and square metres

### National Numeracy Learning Progression

• MuS2: Perceptual multiples

• MuS3: Figurative (imagined units)

• MuS4: Repeated abstract composite units

• MuS5: Coordinating composite units

• MuS6: Flexible strategies for single digit multiplication and division

• MuS7: Flexible strategies for multiplication and division

## Division strategies

Students explore division, work out a solution and explain their thinking (one activity).

### Task 2: Factors and products

Students create various models and representations for the factors of whole numbers (one activity).

Students explore the various ways to partition a dividend (one activity).

### Task 4: Here is a problem

Students use close positioning scaffolds to consider the relationship between problems and not treat them as separate and unrelated (one activity).

Students play the remainders game to reinforce division with remainders (one activity).

## Multiplication strategies

Students choose a counting strategy to quantify a large collection of items using counting strategies (one activity).

### Task 7: Finding dice totals

Students find ways to group the dice and use mental strategies to determine the most effective way to calculate the total (two activities).

Students play the doubles fill game to builds number sense by connecting quantities with symbols and language. (one activity).

Students play a game of bingo with arrays to help students see how numbers can be represented (one activity).