Fluency comes with practice and as soon as they understand the concept and the written mathematics, you may begin to use alternative techniques to build fluency.
One technique is card games. For example, if your student is working on addition and subtraction, games such as 21 (blackjack) help build proficiency quickly. Using poker chips for keeping score are a great way to practice counting skip and multiplication. You may even take the flash cards and play "War."
The parental advice has options for both teaching the concept and building fluency at the level your student is working on. You may get to this advice by selecting the subject under Active Curriculum on the Overview tab of the Dashboard.
Scroll down and select an individual milestone to see activities for you and your student.