Keep on Halving Age 16 to 18 Challenge Level: This article for teachers looks at how teachers can use problems from the NRICH site to help them teach division. The last 2 problems require some thinking. To support this aim, members of the NRICH team work in a wide range of capacities, including providing professional development for teachers wishing to embed rich mathematical tasks into everyday classroom practice. Fractions Age 7 to 11 Explore the idea of fractions using these activities. Geoboards Age 5 to 11 This feature brings together activities which make use of a geoboard or pegboard.

AO elaboration and other teaching resources Achievement Objective: Addition and Subtraction KS1 Age 5 to 7 The lower primary tasks in this collection all focus on adding and subtracting. Exercise 2 Asks students to identify what problems are suitable to solve using the doubling and halving strategy. Asks students to solve word problems. Use a range of multiplicative strategies when operating on whole numbers. Generalise properties of multiplication and division with whole numbers.

For question 10 students should identify that doubling and halving is a useful strategy when both numbers are even — to start with, but this question deserves more discussion, as simply doubling and halving may not necessarily produce a question that is easier to do…. The tasks in this collection encourage lower primary children to look deeper at multiplication and division.

AO elaboration and other teaching resources.

# More doubling and halving word problems

If you already have an Education Sector user ID and password, you are ready to log in. If not, you should register with the link below. Students are also introduced to the concept of proof. The final question have 2 unknowns — and the instruction identifies that they involve doubling and halving.

## More doubling and halving word problems

Which of these pocket money systems would you rather have? Addition and Subtraction Age 5 to 7 These lower primary tasks all involve addition, subtraction or both.

The first few problems have the box on the right hand side of the equation, and all involve halving to find the number in the box. They may need to be taught what a mind map is and what it looks like.

Halving the Triangle Age 16 to 18 Challenge Level: The activity asks students to solve problems, fill in missing numbers in equations using proportional adjustment and solve word problems.

Difficulties with Division Age 5 to 11 This article for teachers looks at how teachers can use problems from the NRICH site to help them teach division. Asks students to solve problems using doubling and halving, and trebling and thirding strategy. Will you be the first to reach the target? You can also solve problems about what happens when we add or take away different numbers!

Halving Age 5 to 7 Challenge Level: He’d like to put the same number of plants in each of his gardens, planting one garden each day. Adding and Taking Away Age 5 to 7 In these activities, you can practise your skills with adding and taking away. These pictures were made by starting with a square, finding the half-way point on each side and joining those points up. Start with 1 x n, and double and halve from roubling. Different Sizes Age 5 to 11 Challenge Level: Geoboards Age 5 to 7 This lower primary feature brings together activities which make use of geoboards.

This article for teachers looks at how teachers can use problems from the NRICH site to help them teach division. Doubling and halving, and trebling and thirding can be used to make multiplication problems easier to solve.

These pictures show squares split into halves. Geoboards Age 5 to 11 This feature brings together activities which make use of a geoboard or pegboard.

## Doubling and halving

Measurement Age 5 sklving 7 These lower primary activities are all about measuring. Follow Up Age 14 to 16 Challenge Level: These are all straightforward and can use the doubling and halving strategy.

What do you notice about the sum of identical triangle numbers? You’ll find money, length and time here.

Exercise 2 Asks students to identify what problems are suitable to solve using the doubling and halving strategy. Register for our mailing list.

Doubling and halving Keywords: