14−(6)=8 (6)+10=16 16−(14)=2 20−(18)=2 (7)+5=12 18−(9)=9 (20)−16=4 (19)−4=15 (14)−8=6 (7)+3=10 15−(9)=6 13+(3)=16 (18)−17=1 14+(4)=18 20−(12)=8 (8)+7=15 11−(6)=5 20−(8)=12 (7)−5=2 12−(6)=6 6+(3)=9 7+(13)=20 (20)−7=13 (13)−9=4 (14)−7=7 (6)+4=10 9+(5)=14 11+(4)=15 13−(11)=2 16−(15)=1 10+(10)=20 19−(3)=16 (9)+6=15 1+(7)=8 (19)−2=17 (5)−1=4 10+(9)=19 (0)+4=4 (12)−1=11 (18)−5=13 12−(3)=9 (11)−8=3 4+(0)=4 (6)+12=18
