Using the Gynzy problem generator, students will review the facts with answers to 10. This is followed by a review of the tens combinations and how the commutative property can help you recall facts quickly. Students then practice the doubles facts, and doubles plus one facts. The lesson continues with a drill of 20 facts on a timer which can be adjusted to further challenge the students. Strategies of adding a 9 and working with larger numbers by putting a ten together are reviewed, and followed by timed Gynzy flashcards.