Number Rounding
When you are rounding to the nearest tens place you actual want to look at the ones place. If the number is 5 or more you will at one more to the tens. If the number is 4 or less you will round down to the current tens place. Wheever you round the places behind that rounded number should be 0.
Number Factoring
When you are factoring numbers you want to get all of the numbers that multiply together to get that number. For instance the factors of 6 are 1,2,3, and 6. This will come in handy later on in your academic careers.