Puzzles to test mathematical skills. Set by Anita Straker.
Solutions on page 31. More brainteasers on www.tes.co.ukteacherbrainteasers Police patrol
Age 7-11
A police car has to patrol some one way streets.
How many different routes can it take from A to B?
How many from A to C?
And how many from D to E?
Number crunching
Age 11-15
Put brackets in this statement to make it true.
3 + 4 - 5 - 3 - 1 - 5 = 12 Find three different ways to do it.
Now make this statement true by inserting suitable brackets and choosing values for a and b from the three numbers 3, 4 and 5.
a + b x a + b + a x b = 122
Brainteaser solutions from page 30
Police patrol
There are 3 different routes from A to B, and 4 different routes from A to C
There are 9 different routes from D to E.
Number crunching
3 + (4 - 5)(-3 - 1 - 5) = 12
3 + 4 - 5 - (3 - 1)(-5) = 12
3 + 4 - (5 - 3 - 1)(-5) = 12
a + (b x (a + b + a) x b) = 122, when a = 5, b = 3