Question

transforma in adunari repetate urmatoarele produse: 3x4,4x3,2x9,5x3,3x5.6x5.

Answer 1

3x4=3+3+3+3=12
4x3=4+4+4=12
2x9=2+2+2+2+2+2+2+2+2=18
5x3=5+5+5=15
3x5=3+3+3+3+3=15
6x5=6+6+6+6+6=30

Answer 2

3+3+3+3(invers)
4+4+4 ↑
9+9
3+3+3+3+3
5+5+5
5+5+5+5+5+5