Why do this
problem?
This problem might be a challenge for younger learners but it
allows them to use and think about some of the mathematical facts
that they have learned. It is wonderful for paired or group
work.
Key questions
What are the possible numbers to go into the middle square?
If you put that number there what numbers are left to
use?
Possible extension
Learners could be encouraged to return
to the problem and to check each of the conditions against their
solution so that they can prove why their solution works.
Possible support
Many children will find it helpful to
use a set of digit cards from $0$ to $9$ so that they can be
moved around.