I have a student, mid 20's, who has ASD. He communicates pretty well and can read well. The problem I have is with teaching him maths. He can do a sum such as 253 - 168 without any problem, but he cannot work out six plus four equals. He can read what it says, but cannot associate that with numbers. Can anyone advise any way of working with him? Have tried pictures and getting him to write out the words in different colours, but nothing seems to be working. Any help would be much appreciated. Thanks in advance.