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