You can guide the child towards good numeracy and mathematics skills. What you need is a practical and step-by-step kit that assists you in your implementations. The kit must tell you what needs to be taught and what the child needs to achieve. It must be able to facilitate your journey towards establishing the kind of learning environment and learning approaches appropriate for the child. The kit must have a step-by-step implementation plan that you can follow, schedule that allows you to pace the child and yourself and a way to gauge and assess the child's achievement.
Most importantly, everything must be made simple to effect, easy to grasp for the child and with implementation systems that can be done within your reach and environment. It must not be something that is out of this world to carry-out.