Why do this
gives children a chance to apply knowledge of
number operations and gain confidence in using a trial and
What could you try first?
How will you record what you do?
Does that fit all the information?
Children could make up their own version of this problem for a
friend to solve.
Using differently coloured counters to represent boys and
girls might help some children access this problem - it will allow
them to refine their answer try without being afraid of
writing down something that turns out to be wrong.