Working Backwards at KS1 Age 5 to 7 The lower primary tasks in this collection could each be solved by working backwards. Geoboards Age 5 to 7 This lower primary feature brings together activities which make use of geoboards. What do you notice about the sum of identical triangle numbers? Teaching should also cover boxes where the missing number is double one of the other numbers, and tripling and thirding too. Asks students to generalise the doubling and halving strategy by introducing algebraic notation. Triangular numbers can be represented by a triangular array of squares.

Different Sizes Age 5 to 11 Challenge Level: Multiplication and Division Age 5 to 7 These lower primary tasks will help you to think about multiplication and division. Register for our mailing list. Doubling Fives Age 5 to 7 Challenge Level: Fractions Age 5 to 7 Try these lower primary tasks if you want to improve your understanding of fractions.

Halving the Triangle Age 16 to 18 Challenge Level: Can you split each of the shapes below in half so that the two parts are exactly the same? AO elaboration and other teaching resources. How do you know they are halves?

The tasks in this collection encourage lower primary ahlving to look deeper at multiplication and division. You’ll find money, length and time here. In these activities, you can practise your skills with adding and taking away.

## Doubling and halving

A simple visual exploration into halving and doubling. Asks students to solve problems using doubling and halving. If not, you should register with the link below.

Pythagorean Triples I Age 11 to 16 The first of two articles on Pythagorean Triples which asks how many right angled triangles can you find with the lengths of each side exactly a whole number measurement.

What do you notice about the sum of identical triangle hqlving Geoboards Age 5 to 7 This lower primary feature brings together activities which make use of geoboards.

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. The number of plants in Mr McGregor’s magic potting shed increases overnight. Hqlving are all straightforward and can use the doubling and halving strategy. However, it does require some idea of prime numbers and how these operate. Will you be the first to reach the target? Age 5 to 7 Challenge Level: Students are also introduced to the concept of proof.

Triangular numbers can be represented by a triangular array of squares.

# Primary Resources: Maths: Calculations: Doubling & Halving

Here are some challenges that you can work on and then see if you can convince someone that your solutions are right! The first of two articles on Pythagorean Triples which asks how many right angled triangles can you find with the lengths of each side exactly a whole number measurement. Shaping It Age 5 to 11 Challenge Level: Age 3 oslving 7 This article, written by Dr.

Teaching should also cover boxes where the missing number is double one of the other numbers, and tripling and thirding too.

These pictures were made by starting with a square, finding the half-way point on each side and joining those points up. How can he do it? This activity focuses on doubling multiples of five. As students should already be at stage 6 before they attempt such an exercise, this should not cause problems for students, though work with large numbers should be forming part of the teaching.

Baskets Age 3 to 5 Counting reliably Solving problems, including doubling, halving and sharing. Good discussion is warranted as a follow-up. The activity asks students to solve problems, fill in missing numbers in equations using proportional adjustment and solve word problems.

However, the concept of proof and the power of algebra can be followed up in discussions.

Fractions Age 5 to 7 Try these lower primary tasks if you want to improve your understanding of fractions.