Puzzles to test mathematical skills. Set by Anita Straker.
Solutions on page 31. More brainteasers on www.tes.co.ukteacherbrainteasers
Here is a three-by-three grid of numbers.
Cross out two numbers on the grid.
The rest of the numbers in each row and column must total 10.
This pattern is made from 16 matchsticks.
Take away just four matches to leave exactly four equilateral triangles.