Correcto: 7 + 8, 9 + 6, 4 + 11, 20 - 5, 30 - 15, Incorrecto: 15 + 5, 9 + 7, 17 - 3, 12 + 2, 10 - 5,

Sumas y Restas

Leaderboard

Visual style

Options

Switch template

Continue editing: ?