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Calculo mental 3
Autor :
CEIP SAN JUAN BOSCO 2004
1. 20
2. 18
3. 21
4. 40
5. 15
3x5
20-5
10x2
6x3
5x4
5+5+5
40
50-10
12+8
21
20+20
18
15+6
20
20-2
5x8
20+1
7x3
9x2
10+5