Explain the effect on the product when scaling the factors up and down by the same amount

Maths

 In this unit pupils will explain why the product stays the same when one factor is doubled and the other is halved using knowledge of equivalence. They will explain the effect on the quotient when scaling the dividend and divisor by the same amount. In the future unit pupils will describe the relationship between two factors and use a ratio grid to calculate unknown values. 

 In the prior unit pupils explained how to identify a multiple or common multiple to solve problems in a range of contexts. In this unit pupils will explain why the product stays the same when one factor is doubled and the other is halved using knowledge of equivalence. They will explain the effect on the quotient when scaling the dividend and divisor by the same amount.

Using equivalence to calculate

 What is the missing factor in the equation in the diagram?

What is the missing number in this equation? 10 × 25 = {{ }} × 5

What is the missing number in this equation? 20 × 12 = 80 × {{ }} 

 Andeep scales the equation 22 × 40 = {{ }} to make it easier to answer. Which of these equations is the most sensible and efficient choice?

Laura is trying to find the product of 35 × 20 and writes some possible equations. Which is correct and will help her find the product?

Use scaling to help you find the product: 250 × 32 = {{ }}

What is the missing factor in the equation in the diagram?

What is the missing number in this equation? 14 × 5 = {{ }} × 10

What is the missing number in this equation? 15 × 28 = 30 × {{ }}

 Which expressions are equal to 16 × 42?

Use scaling to help you find the product: 5 × 62 = {{ }}

Use scaling to help you find the product: 250 × 16 = {{ }}

This lesson will soon be taken down.

Explain the effect on the product when scaling the factors up and down by the same amount

Lesson outcome