If you son is in daycare now, soon he will play by himself. Also, you can invite your friend's kids to play with him or take him to your friend's house.
Another way to solve this problem is give him a sibling. :-)
As for the addition and subtraction, he might not ready yet. Wait after he turns 5 years old.
Another way to solve this problem is give him a sibling. :-)
As for the addition and subtraction, he might not ready yet. Wait after he turns 5 years old.