multiplication facts are simply that times table in this case 5
each side is multiplied together.
Multiplication facts and tables can be found all over the internet. A good place for worksheets for multiplication is through the Education website. Also, many teacher stores will have products regarding multiplication.
what do you mean by multiplication
The answer depends on different from WHAT!
A good fun website for multiplication facts is multiplication .com
Some multiplication facts for 81 are 9 x 9 3 x 27 1 x 81
If you know them up to at least 9, you will be able to do big multiplication problems as well as move on to division, algebra, and maybe even calculus.