Problem: “There are eight flies on this fly flip. (The students can see the eight on the bottom and five flies on their side of the fly flip.) How many flies are on the other side?” Record 5 + ? = 8 on the board or modelling book. Encourage the students to model eight as five fingers and three fingers and then work out that there must be three flies on the reverse side. Record 5 + 3 = 8 on the board or modelling book.

Examples: Repeat for the nine, five, six, 10, and seven fly flips.

Problem: Show the students the eight fly flip with three flies visible to them. Ask how many flies they can see and then what number they can see. Discuss how many flies are hidden from the students. The students use their fingers if needed. Discuss the answer and record 3 + 5 = 8 on the board or modelling book.

Examples: Repeat for the nine, five, six, 10, and seven fly flips.