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