This Fluency Activity is a part of the Lesson 9, Unit 2, Grade 1. This activity reinforces the make ten addition strategy as students relate 10 + n addition sentences to an equivalent sentence with an addend of 8 or 9. Students ready to use the numeral side of the 5-group cards should be encouraged to do so. Assign students partners of equal ability. Students arrange 5-group cards from 0 to 10, including the extra 5, and place the "=" card between them.