Maths stategy

This week the strategy I have learned is
 
1 Using arrays to solve x problems

2 Here is an example of how to use it

3x4=12    4x5=20    5x3=15
0000         00000      000
0000         00000      000
0000         00000      000
4+4+4       00000      000
                 00000      000
              5+5+5+5    3+3+3+3+3