The aim is to complete the grid before the time runs out. The questions test multiplication, division and addition. There are three times on the clock to enable speed of response to develop. The key message from the National Numeracy Framework is that times tables should be learnt by heart. Recitation, both individually and as a whole class, really helps with this.
Weekly tests give the children a target.
Advertise the week's focus table outside the classroom so that parents can help. Focus on the patterns and hints for each times table. Talk about multiples and factors and teach tricks for spotting multiples.