Do your kiddos like playing games? Missing addend is a great math game. Throw out some sort of counter (hearts, snowballs, jingle bells, unifix cubes, buttons), hide some under a cup, and ask students to figure out how many you hid.
Teach students to use "math talk" to describe what they did, and then take it one step further and describe what their thinking was when they were solving the problem.
Hop on over to Kinder Kapers to grab a copy of the Valentine recording sheet and math talk page.