Matrix M1

| 1.0 2.0 3.0 |
| 4.0 5.0 6.0 |
| 7.0 8.0 9.0 |

M1 is rectangular
Matrix M2

| 10.0 11.0 12.0 |
| 13.0 14.0 15.0 |
| 16.0 17.0 18.0 |

M2 is rectangular
Matrix M3

| 19.0 20.0 21.0 |
| 22.0 23.0 24.0 25.0 26.0 27.0 28.0 29.0 30.0 31.0 |
| 32.0 33.0 |

M3 is not rectangular
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Addition Example:
-----------------

| 1.0 2.0 3.0 |
| 4.0 5.0 6.0 |
| 7.0 8.0 9.0 |

plus

| 10.0 11.0 12.0 |
| 13.0 14.0 15.0 |
| 16.0 17.0 18.0 |

equals

| 11.0 13.0 15.0 |
| 17.0 19.0 21.0 |
| 23.0 25.0 27.0 |

-----------------------
Multiplication Example:
-----------------------

| 1.0 2.0 3.0 |
| 4.0 5.0 6.0 |
| 7.0 8.0 9.0 |

times

| 1.0 2.0 |
| 3.0 4.0 |
| 5.0 6.0 |

equals

| 22.0 28.0 |
| 49.0 64.0 |
| 76.0 100.0 |