They can start with asking simple math questions and going on to harder questions, as the child gets older. Parents should continually ask children mathematical computation questions and give positive feedback when they respond. Children love to receive positive feedback and that encourages continues growth.
Children can take classes from various organizations that will support their mathematical development. These organizations may offer classes in the summer or on the weekends. Some of the classes can teach children how to build robots, toy cars, toy airplanes, etc. These classes may be in the area of engineering, computer science or some other technical field.
If you are a swing trader or a position trader, it is easier to maintain a trade-by-trade trading journal. However, a day trader or active trader may find it difficult to document each trade, so a general sentiment of how he is maintaining his system and the overall sentiment on the day may be more appropriate. As you learn some of the various risk management techniques, it will become simpler to use a trading journal on a per-trade basis. Until then, let's take our time.
Parents can assist with developing a lot of the fundamental skills needed for children to succeed in math when they attend school. Parents can do things that will support the schools and hopefully the schools will do the rest.