The learning material was engaging because Peter was learning about numbers at the moment. As such I am able to design the learning materials according to his needs. By placing it somewhere that he was able to see it frequently, I realised that he was taking initiative to learn independently by taking the makers to practise on it or by just standing in front of it to read and see the words.
After placing it for a few weeks, I realised that he was able to recognise them better. Even though spelling the numbers was not easy for Peter but I think with suitable learning materials he is encouraged to learn at his own pace until he succeeds.