This Application Problem is a part of the Lesson 17, Unit 2, Grade 1. Gisella had 13 markers in her bag. Eight markers fell out of the bag. How many markers does Gisella have now? While circulating, notice which students already recognize the application of the take from ten strategy, previously applied only to subtracting 9. Notice which students are crossing off one at a time instead of crossing off 8 quickly.