My personal approach will be having my toddler to explore these skills - the matching, sorting, group etc. naturally. I will just give him the awareness and through much exploration, I am sure my toddler will soon grasp the skills.
Here I have posted the final result of Maximus's matching skill (match the transportation). I started with giving him a picture magnet of a transport and then he will place it on the picture of the same transport in the book. We do this every night in a playing manner. But yesterday night, he decided to pick his own picture magnet and turn the pages to match the picture. Quickly I grabbed my recording device (mobile phone) and record the moment.
I was thrilled with excitement and proud of his achievement! Check it out...