4 = 5 = ayo berlatih 4 hitunglah dengan jarimu 1 3 – 2 = 6 8 – 7 = 2 4 – 1 = 7 6 – 2 = 3 5 – 3 = 8 9 – 8 = 4 6 – 4 = 9 7 – 2 = 5 9 – 5 = 10 8 – 1 = 16