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Càlcul mental
Contributed by: Perez
  • 1. 12*12
A) 24
B) 122
C) 121
D) 144
  • 2. 13*13
A) 256
B) 169
C) 121
D) 196
  • 3. 15*15
A) 225
B) 30
C) 1515
D) 256
  • 4. 17*17
A) 361
B) 169
C) 298
D) 289
  • 5. 20*20
A) 20
B) 400
C) 40
D) 200
  • 6. 19*19
A) 261
B) 361
C) 39
D) 121
  • 7. 14+14
A) 256
B) 28
C) 144
D) 196
  • 8. 11*13
A) 143
B) 145
C) 133
D) 153
  • 9. 18*18
A) 164
B) 364
C) 324
D) 264
  • 10. 11*11
A) 1111
B) 22
C) 121
D) 111
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