An enlarged board could be adapted for use with larger groups or the whole class during the numeracy period.
You will need to have some counters with
+ ,
- ,
x ,
= ,
(plus, minus, times and equals) on them.
You will need these instructions.
  How many sums can you find in the grid?
  Use the counters with the signs on to help you.
  Write down the sums you find.
This activity can be done by individuals, pairs or small groups.
  Some go across and back.
  Some go up and down.
  Some go diagonally.