Brainteasers

23rd March 2001 at 00:00
Puzzles to test mathematical skills

AGE 6-8: Six coins

Julie has six coins.

They are all pound;1 coins, 10p coins or 1p coins.

1. Exactly two of Julie's coins are pound;1 coins.

How much does she have altogether?

There are 5 possibilities. Can you find them?

2. Julie has at least one pound;1 coin, at least one 10p coin, and at least one 1p coin.

How much does Julie have altogether?

There are 10 possibilities. Can you find them?

AGE 9-11: All square

These counters form a square. So do these.

Wat is the greatest number of counters you can put on a 4x4 grid without forming a square?

* ANSWERS page 37 - Brainteaser solutions

All square

On a 2x2 grid you can fit 3 counters,

on a 3x3 grid you can fit 6 counters,

on a 4x4 grid you can fit 10 counters...

without forming a square. For example,

Six coins

1. The five possibilities are:

pound;2.04, pound;2.13, pound;2.22, pound;2.31, pound;2.40

2. The 10 possibilities are:

pound;4.11, pound;3.21, pound;3.12, pound;2.31, pound;2.22

pound;2.13, pound;1.41, pound;1.32, pound;1.23, pound;1.14


Subscribe to get access to the content on this page.

If you are already a Tes/ Tes Scotland subscriber please log in with your username or email address to get full access to our back issues, CPD library and membership plus page.

Not a subscriber? Find out more about our subscription offers.
Subscribe now
Existing subscriber?
Enter subscription number

Comments

The guide by your side – ensuring you are always up to date with the latest in education.

Get Tes magazine online and delivered to your door. Stay up to date with the latest research, teacher innovation and insight, plus classroom tips and techniques with a Tes magazine subscription.
With a Tes magazine subscription you get exclusive access to our CPD library. Including our New Teachers’ special for NQTS, Ed Tech, How to Get a Job, Trip Planner, Ed Biz Special and all Tes back issues.

Subscribe now