id: 06150385
dt: j
an: 2013b.00554
au: Mooney, Edward S.; Bair, Sherry L.
ti: Composites and primes.
so: Math. Teach. Middle Sch. 17, No. 2, 70-73 (2011).
py: 2011
pu: National Council of Teachers of Mathematics (NCTM), Reston, VA
la: EN
cc: F60 F30 D50 A20
ut: prime numbers; divisibility; problem solving strategies; experience
    reports; lower secondary; recreational mathematics
ci: 
li: http://www.jstor.org/stable/10.5951/mathteacmiddscho.17.2.0070
ab: The article presents students’ solutions and solution strategies on the
    problem: Place the digits 1 through 9 into a $3\times 3$ grid so that
    each row forms a three-digit composite number and each column forms a
    three-digit prime number; each digit must be used once in the grid;
    explain how you found your solution and how many solutions can be
    found.
rv: Peter Dürr (Linkenheim)