Making 24 - No 2
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Transcript of Making 24 - No 2
Making 24 - No 2Author(s): John BerrySource: Mathematics in School, Vol. 36, No. 3 (May, 2007), p. 10Published by: The Mathematical AssociationStable URL: http://www.jstor.org/stable/30216023 .
Accessed: 23/09/2013 11:53
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This content downloaded from 130.60.206.43 on Mon, 23 Sep 2013 11:53:34 AMAll use subject to JSTOR Terms and Conditions
MAKING 24-No12 by John Berry
This puzzle provides a nice warm-up activity for students from Primary through to the sixth form as a way of getting the brain in gear and as a way of encouraging working in pairs. The rules are quite simple:
~irw
I1 ~ i+ B fdzi+ C
aaaI +:e aaa Bs -- BPEI _ t
000.
I~ ;;;;;~
~ +-= ~_= ~~~:=+-
~~=i~=~ 1
=- I
Use all four numbers only once to make the number 24 using the operations of arithmetic: adding, subtracting, multiplying and/or dividing. Each number must be used once and only once!
Be careful! Do not muddle up 6s and 9s. The base of the digit is towards the centre. F
....b
. ..
Keywords: Puzzles.
Author John Berry, The Centre for Teaching Mathematics, The University of Plymouth, Plymouth, Devon PL4 8AA. e-mail: [email protected]
10 Mathematics in School, May 2007 The MA web site www.m-a.org.uk
This content downloaded from 130.60.206.43 on Mon, 23 Sep 2013 11:53:34 AMAll use subject to JSTOR Terms and Conditions