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Matemàtiques càlcul mental
Autor :
Anna Batalla
1.
4X12
A
48
B
56
C
64
2.
12X12
A
200
B
136
C
144
3.
7X7
A
50
B
49
C
45
4.
47+8
A
61
B
56
C
55
5.
98+12
A
115
B
110
C
108
6.
90-19
A
51
B
61
C
71
7.
11X11
A
121
B
120
C
123
8.
3X9
A
28
B
27
C
29
9.
7X9
A
70
B
66
C
63
10.
9X12
A
108
B
123
C
212
11.
6-2x9
A
26
B
36
C
12
12.
20-10x3
A
30
B
20
C
10
13.
3X(6-4)
A
14
B
6
C
10
14.
765-66
A
700
B
701
C
699
15.
54-38
A
14
B
16
C
18