To become twice as many / to multiply by two.

The act of splitting an object or value down into smaller parts.

A factor is a number which exactly divides another whole number.

A product is the result of two or more numbers multiplied together.

Double 2-digit numbers and record as multiplications where one of the factors is 2

Maths

Explain how doubling and halving are related

Halve even 2-digit numbers and multiples of 10

Identify missing factors when one factor is 2

Use knowledge of doubling, halving and the 2 times table to solve problems

In this unit pupils will learn how multiplication with 2 as a factor relates to doubling and how we can see halving as the inverse of doubling, deriving the related halving fact from a known double. In the future unit pupils will double and halve 2 digit numbers. Pupils will use knowledge of doubling and halving and the 2x table to solve problems.

In the prior unit pupils represented the 2x 10x table in different ways. They explained the relationship between adjacent multiples of 2/10 and how factor pairs can be written in any order. In this unit pupils will learn how multiplication with 2 as a factor relates to doubling and how we can see halving as the inverse of doubling, deriving the related halving fact from a known double. 

In this unit pupils will learn how multiplication with 2 as a factor relates to doubling and how we can see halving as the inverse of doubling, deriving the related halving fact from a known double.

Multiplying by 2, doubling and halving (factors and products)

Which of these equations could I use doubling knowledge to solve?

Complete the sentence. We can partition 6 into __________

Complete the sentence. We can partition 19 into __________

Which doubling fact has been represented on this bar model?

Double 2-digit numbers and record as multiplications where one of the factors is 2

Lesson outcome