suma
3 + 12
15 (quince)
19 - 1
18 (dieciocho)
2 + 2- 1
3 (tres)
18 + 2
20 (veinte)
15 - 4
11 (once)
3 + 3 + 6
12 (doce)
14 + 2
16 (dieciséis)
18 - 5
13 (trece)
10 + 10 - 3
17 (diecisiete)
13 + 4
17 (diecisiete)
20 - 7
13 (trece)
18 - 8 + 5
15 (quince)
11 + 8
19 (diecinueve)
15 - 6
9 (nueve)
19 (diecinueve)