Resposta :
1) 9 + 8 = Seventeen
9 + 7 = Sixteen
10 + 3 = Thirteen
6 + 5 = Eleven
9 + 9 = Eighteen
8 + 7 = Fifteen
7 + 6 = Thirteen
2) 20 - 1 = Nineteen
14 - 2 = Twelve
15 - 4 = Eleven
21 - 1 = Twenty
18 - 3 = Fifteen
16 - 6 = Ten
17 - 3 = Fourteen
19 - 6 = Thirteen
3) 3 × 3 = Nine
5 × 3 = Fifteen
5 × 2 = Ten
7 × 2 = Fourteen
4 × 4 = Sixteen
11 × 1 = Eleven
6 × 2 = Twelve
6 × 3 = Eighteen