This Fluency Activity is a part of the Lesson 36, Unit 1, Grade 1. This activity addresses the core fluency objective for Grade 1 of adding and subtracting within 10. Assign students partners of equal ability. Students put numeral cards face down in front of them. One partner flips a card and adds counters to the ten-frame (e.g., a partner flips 9 and adds 9 red counters to the ten-frame). The other partner fills up the empty cells, using the other side of the counters (e.g., 1 white counter).