Simple operations 4
- - - - - - - - - -
Instructions: Press one of the buttons on the right column The correct number is put in red .
13 - 3 =
4 + 2 =
6 + 9 =
8 + 6 =
10 + 10 =
2 + 6 =
15 - 6 =
13 - 5 =
9 - 7 =
13 - 11 =
6 - 2 =
3 + 11 =
5 + 10 =
7 + 4 =
9 + 6 =
11 - 4 =
9 - 4 =
16 - 6 =
12 - 8 =
12 - 10 =
7 - 3 =
4 + 10 =
6 + 3 =
8 + 11 =
10 + 2 =
2 + 11 =
11 - 5 =
17 - 7 =
20 - 9 =
21 - 11 =
10 - 2 =
3 + 3 =
5 + 4 =
7 + 10 =
9 + 11 =
11 + 10 =
6 - 4 =
10 - 6 =
16 - 8 =
20 - 10 =
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®Arturo Ramo García.-Record of intellectual property of Teruel (Spain) No 141, of 29-IX-1999 Plaza Playa de Aro, 3, 1º DO 44002-TERUEL