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