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two minus make positive make sense in the operations with real numbers.
In addition and subtraction, minus a negative number means plus it's opposite, e.g. 5-(-3)=5+3
In division and...

Take 6 for example, it has factors 1, 2, 3 and 6, since they can divide 6 completely.
while 6, 12, 18... are multiples of 6 since 6 can divide them completely.

Factor of a given number can...

I am in great need of some ideas about how to make mathematical modeling problem or investigation problem. On the following topics:
complex number, vector, mathematical induction, sequences and...

Thank you! I will have a try, and I can give her more prise other than money. I think she wants my time the most.

My daughter is nearly seven now, she always forgets to put things back to their places, what can I do to help her to be more organized?:( :(