you get flash cards with the multiplication problem on one side and the answer on the other. You use it to review or memorize them.
Depending on the person would determine which way is easier for he or she.
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you probably will learn multiplication in 3rd or 4th grade, but it will be pushed until 8th grade where you learn pre-algebra
The fastest way to learn and do division is memorize your division math facts. It is easier to memorize the division facts, knowing your multiplication facts will help as well.
Is there an easy way to learn conversions? It's easy. 1 cm cubed is 1 mL.
You can reduce multiplication to repeated additions. You could also replace the resulting additions by repeated incrementing. For example, to calculate 20 + 13, continue counting 13 numbers from 20. But that would be extremely boring and inefficient. Better if you just learn to do it the way they teach in school.
No. Multiplication of matrices is, in general, non-commutative, due to the way multiplication is defined.