# Brainteasers

Puzzles to test mathematical skills, set by Anita Straker. Solutions below More brainteasers on www.tes.co.ukteacherbrainteasers

Differences

Use all the numbers 1, 2, 3 and 4.

Write one number in every circle.

The numbers joined by lines must have a difference of more than 1.

Now try this one. Use all the numbers 1, 2, 3, 4 and 5.

SOLUTIONS Differences (age 5 to 10) Reflections of these are also possible.

In the playground

A square playground is to be paved with slabs each 1 metre by 1 metre square.

Only whole slabs will be used.

The paving slabs have to be bought in packs of 50. Fifteen packs of slabs are needed to make sure that there are enough slabs.

What is the exact size of the playground?

SOLUTIONS Playground (age 9 to 14) The playground measures 27m x 27m.

Between 700 and 750 slabs will be used to pave the playground. 26 x 26 = 676, which is too few, and 28 x 28 = 784, which is too many. So the exact number of slabs needed must be 27 x 27 =729.

It only takes a moment and you'll get access to more news, plus courses, jobs and teaching resources tailored to you

## Latest stories

• ### Why do schools find it so difficult to learn?

Kester Brewin
21 October 2019
• ### Ofsted asked to investigate 'off-rolling' row MAT

John Roberts
21 October 2019
• ### Do progression frameworks really help?

Michael Tidd
21 October 2019
• ### 'Erasmus+ changes lives. Don't let students miss out'

Stephen Exley
21 October 2019
• ### The teachers risking their jobs to save the planet

Dave Speck
21 October 2019
• ### GCSE resits: 2 in 3 students 'make no progress'

Julia Belgutay
21 October 2019
• ### ‘Use the school curriculum to tackle racism’

Emma Seith
21 October 2019
• ### The PRU, the boarding school and a unique experiment

Leanne Forde-Nassey and Ollie Ward
21 October 2019
• ### Requests for late entry for summer-born plateau

Catherine Lough
21 October 2019
• ### WATCH: 'Let teachers tell truth about climate change'

Dave Speck
21 October 2019